diff --git a/42.20/media/lua/client/QMIA_Integration.lua b/42.20/media/lua/client/QMIA_Integration.lua
new file mode 100644
index 0000000..bfc8118
--- /dev/null
+++ b/42.20/media/lua/client/QMIA_Integration.lua
@@ -0,0 +1,101 @@
+require "QMIA_State"
+require "TimedActions/QMIA_ArrangeAction"
+require "LootSorter_Core"
+require "LootSorter_Plan"
+require "LootSorter_DepositAction"
+require "LootSorter_ContextMenu"
+
+local function feedback(playerNum, accepted, enabled)
+    local player = getSpecificPlayer(playerNum)
+    if not player then return end
+    local message = "Could not update Item Arrange mode."
+    if accepted then
+        message = enabled and "Item Arrange enabled. Configure sorting to select items."
+            or "Item Arrange disabled. Deliveries use container storage."
+    end
+    LootSorter.notify(player, message)
+end
+
+function QMIA.setMark(obj, ci, enabled, playerNum)
+    local player = getSpecificPlayer(playerNum)
+    local square = obj and obj:getSquare()
+    if not player or not QMIA.canAccess(square, player) then return end
+    local args = { x = square:getX(), y = square:getY(), z = square:getZ(),
+        oi = obj:getObjectIndex(), ci = ci, enabled = enabled, playerNum = playerNum }
+    if isClient() then
+        sendClientCommand(player, QMIA.MOD_ID, "setMark", args)
+    else
+        feedback(playerNum, QMIA.applyRequest(player, args), enabled)
+    end
+end
+
+-- Hook Quartermaster's common entry point: both world and inventory menus, every
+-- stacked object and every separate container index receive the toggle.
+if not QMIA.menuInstalled then
+    QMIA.menuInstalled = true
+    local original = LootSorter.addBoxOptions
+    function LootSorter.addBoxOptions(menu, obj, ci, suffix, playerNum)
+        original(menu, obj, ci, suffix, playerNum)
+        local square = obj and obj:getSquare()
+        if not QMIA.canAccess(square, getSpecificPlayer(playerNum)) then return end
+        local marked = QMIA.isMarked(obj, ci)
+        local label = (marked and "[x] Item Arrange" or "[ ] Item Arrange") .. (suffix or "")
+        local option = menu:addOption(label, nil, function()
+            QMIA.setMark(obj, ci, not marked, playerNum)
+        end)
+        option.onHighlightParams = { obj }
+        option.onHighlight = LootSorter.onHighlightBox
+        local tip = ISWorldObjectContextMenu.addToolTip()
+        tip.description = "Deliver matching items to this container's tile using Item Arrange. "
+            .. "Uses the same placement as Shift-dropping. No Shift key or mouse aim needed. "
+            .. "Choose matching categories/items with Configure sorting."
+        option.toolTip = tip
+    end
+end
+
+-- This changes the destination only. Quartermaster still loads bags, walks, plans
+-- trips and protects equipped/favorited/hotbar items using its own implementation.
+if not QMIA.depositInstalled then
+    QMIA.depositInstalled = true
+    local original = LootSorter.DepositAction.new
+    function LootSorter.DepositAction:new(character, item, srcContainer, destContainer)
+        local obj, ci = QMIA.containerTarget(destContainer)
+        if obj and QMIA.isMarked(obj, ci) then
+            return QMIArrangeAction:new(character, item, srcContainer, destContainer)
+        end
+        return original(self, character, item, srcContainer, destContainer)
+    end
+end
+
+-- A marked container represents display space, so its internal weight capacity
+-- must not prevent routing to it. IA.CheckSpace controls placement at execution.
+-- Copy records: no global ItemContainer methods or original planner data change.
+if not QMIA.plannerInstalled then
+    QMIA.plannerInstalled = true
+    local original = LootSorter.planTrips
+    function LootSorter.planTrips(items, boxes, carriers, budget, accepts)
+        local adjusted = {}
+        for i, box in ipairs(boxes) do
+            local obj, ci = QMIA.containerTarget(box.container)
+            if obj and QMIA.isMarked(obj, ci) then
+                local copy = {}
+                for key, value in pairs(box) do copy[key] = value end
+                copy.capacity, copy.used = math.huge, 0
+                adjusted[i] = copy
+            else
+                adjusted[i] = box
+            end
+        end
+        return original(items, adjusted, carriers, budget, accepts)
+    end
+end
+
+if not QMIA.resultsInstalled then
+    QMIA.resultsInstalled = true
+    Events.OnServerCommand.Add(function(module, command, args)
+        if module ~= QMIA.MOD_ID or command ~= "markResult" or not args then return end
+        feedback(tonumber(args.playerNum) or 0, args.accepted, args.enabled)
+    end)
+end
+
+print("[QuartermasterItemArrange] compatibility loaded")
diff --git a/42.20/media/lua/server/QMIA_Server.lua b/42.20/media/lua/server/QMIA_Server.lua
new file mode 100644
index 0000000..d52cbac
--- /dev/null
+++ b/42.20/media/lua/server/QMIA_Server.lua
@@ -0,0 +1,11 @@
+require "QMIA_State"
+
+Events.OnClientCommand.Add(function(module, command, player, args)
+    if module ~= QMIA.MOD_ID or command ~= "setMark" then return end
+    local accepted = QMIA.applyRequest(player, args)
+    local payload = type(args) == "table" and args or {}
+    sendServerCommand(player, QMIA.MOD_ID, "markResult", {
+        accepted = accepted, enabled = payload.enabled == true,
+        playerNum = payload.playerNum,
+    })
+end)
diff --git a/42.20/media/lua/shared/QMIA_State.lua b/42.20/media/lua/shared/QMIA_State.lua
new file mode 100644
index 0000000..1c5179a
--- /dev/null
+++ b/42.20/media/lua/shared/QMIA_State.lua
@@ -0,0 +1,60 @@
+-- Per-compartment flags on the original world object. No Quartermaster data is changed.
+QMIA = QMIA or {}
+QMIA.MOD_ID = "QuartermasterItemArrange"
+QMIA.DATA_KEY = "QMIArrange"
+
+function QMIA.isMarked(obj, ci)
+    if not obj or ci == nil or not obj:hasModData() then return false end
+    local flags = obj:getModData()[QMIA.DATA_KEY]
+    return type(flags) == "table" and flags[tostring(ci)] == true
+end
+
+function QMIA.containerTarget(container)
+    if not container then return nil end
+    local obj = container:getParent()
+    if not obj or not obj.getContainerCount or not obj.getSquare then return nil end
+    for ci = 0, obj:getContainerCount() - 1 do
+        if obj:getContainerByIndex(ci) == container then return obj, ci end
+    end
+end
+
+-- Also called by the authoritative timed action, where Quartermaster's client helpers
+-- aren't loaded. Respect safehouse rules on both sides of a multiplayer connection.
+function QMIA.canAccess(square, player)
+    if not square or not player then return false end
+    if SafeHouse and SafeHouse.isSafehouseAllowLoot then
+        return SafeHouse.isSafehouseAllowLoot(square, player) ~= false
+    end
+    return true
+end
+
+function QMIA.writeMark(obj, ci, enabled)
+    local md = obj:getModData()
+    local flags = md[QMIA.DATA_KEY] or {}
+    flags[tostring(ci)] = enabled and true or nil
+    md[QMIA.DATA_KEY] = flags
+    obj:transmitModData()
+end
+
+-- Validate a client request against the current world. No client-supplied ModData
+-- snapshot is accepted, so changing one compartment cannot overwrite another.
+function QMIA.applyRequest(player, args)
+    if type(args) ~= "table" or type(args.enabled) ~= "boolean" then return false end
+    for _, key in ipairs({ "x", "y", "z", "oi", "ci" }) do
+        local value = args[key]
+        if type(value) ~= "number" or value ~= value or value == math.huge
+                or value == -math.huge or value ~= math.floor(value) then return false end
+    end
+    if args.ci < 0 or args.oi < 0 or not player then return false end
+    local square = getCell():getGridSquare(args.x, args.y, args.z)
+    if not QMIA.canAccess(square, player) then return false end
+    if math.abs(player:getX() - args.x) > 20 or math.abs(player:getY() - args.y) > 20
+            or math.abs(player:getZ() - args.z) > 1 then return false end
+    local objects = square:getObjects()
+    if args.oi >= objects:size() then return false end
+    local obj = objects:get(args.oi)
+    if not obj or not obj.getContainerCount or args.ci >= obj:getContainerCount()
+            or not obj:getContainerByIndex(args.ci) then return false end
+    QMIA.writeMark(obj, args.ci, args.enabled)
+    return true
+end
diff --git a/42.20/media/lua/shared/TimedActions/QMIA_ArrangeAction.lua b/42.20/media/lua/shared/TimedActions/QMIA_ArrangeAction.lua
new file mode 100644
index 0000000..6f98db2
--- /dev/null
+++ b/42.20/media/lua/shared/TimedActions/QMIA_ArrangeAction.lua
@@ -0,0 +1,70 @@
+require "QMIA_State"
+require "IAArrange"
+require "TimedActions/IAArrangeAction"
+
+-- Use Item Arrange's actual drop/arrange implementation and duration. Keeping this
+-- class in shared makes its complete() available to Build 42 multiplayer servers.
+QMIArrangeAction = IAArrangeAction:derive("QMIArrangeAction")
+
+function QMIArrangeAction:new(character, item, srcContainer, destContainer)
+    local obj = QMIA.containerTarget(destContainer)
+    local o = IAArrangeAction.new(self, character, item, srcContainer, obj and obj:getSquare())
+    o.destContainer = destContainer
+    o.stopOnWalk = true
+    o.stopOnRun = true
+    o.stopOnAim = true
+    return o
+end
+
+-- A full surface / missing load must not cancel the remaining Quartermaster haul.
+-- Revalidate at start and complete instead; skipped items stay in their carrier.
+function QMIArrangeAction:isValid() return true end
+
+function QMIArrangeAction:canArrange()
+    local item, src, square, player = self.item, self.srcContainer, self.dropSquare, self.character
+    if not item or not src or not square or not player then return false end
+    local obj, ci = QMIA.containerTarget(self.destContainer)
+    if not obj or obj:getObjectIndex() < 0 or obj:getSquare() ~= square
+            or not QMIA.isMarked(obj, ci) then return false end
+    -- Only unload carried items. A skipped Quartermaster load is never teleported.
+    if not src:isInCharacterInventory(player) or not src:contains(item)
+            or item:getContainer() ~= src or not src:isRemoveItemAllowed(item) then return false end
+    if item:isEquipped() or item:isFavorite() or item:getIsCraftingConsumed() then return false end
+    if not QMIA.canAccess(square, player) then return false end
+    local here = player:getSquare()
+    if not here or here:getZ() ~= square:getZ()
+            or math.abs(here:getX() - square:getX()) > 1
+            or math.abs(here:getY() - square:getY()) > 1
+            or here:isSomethingTo(square) then return false end
+    return IA.CheckSpace(square, item) == true
+end
+
+function QMIArrangeAction:waitToStart()
+    if not self:canArrange() then return false end
+    self.character:faceLocation(self.dropSquare:getX(), self.dropSquare:getY())
+    local waitingForTransaction = IAArrangeAction.waitToStart(self)
+    return self.character:shouldBeTurning() or waitingForTransaction
+end
+
+function QMIArrangeAction:start()
+    self.qmiaSkip = not self:canArrange()
+    if self.qmiaSkip then
+        self.action:setTime(0)
+        return
+    end
+    self.character:faceLocation(self.dropSquare:getX(), self.dropSquare:getY())
+    IAArrangeAction.start(self)
+end
+
+function QMIArrangeAction:update()
+    if self.qmiaSkip then return end
+    self.character:faceLocation(self.dropSquare:getX(), self.dropSquare:getY())
+    IAArrangeAction.update(self)
+end
+
+function QMIArrangeAction:complete()
+    -- The server rechecks ownership, distance and available space immediately
+    -- before using Item Arrange's own removal/drop/arrange implementation.
+    if self.qmiaSkip or not self:canArrange() then return true end
+    return IAArrangeAction.complete(self)
+end
diff --git a/42.20/mod.info b/42.20/mod.info
new file mode 100644
index 0000000..fc44c19
--- /dev/null
+++ b/42.20/mod.info
@@ -0,0 +1,8 @@
+name=Quartermaster - Item Arrange Compatibility
+id=QuartermasterItemArrange
+author=Local compatibility add-on
+modversion=1.0.0
+versionMin=42.20
+require=Quartermaster,ItemArrange
+loadAfter=Quartermaster,ItemArrange
+description=Mark any Quartermaster-sortable container as Item Arrange. Matching deliveries go to its tile using Item Arrange's Shift-drop action, with automatic facing and no keyboard or mouse positioning required.
diff --git a/README.md b/README.md
index 7a4a916..c242e51 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,78 @@
 # QuartmasterArrange
 
-Quartermaster X Item Arrange 
\ No newline at end of file
+Quartermaster x Item Arrange compatibility for Project Zomboid Build 42.20 and later.
+
+Mod ID: `QuartermasterItemArrange`
+
+Requires [Quartermaster](https://steamcommunity.com/sharedfiles/filedetails/?id=3761216758)
+and [Item Arrange](https://steamcommunity.com/sharedfiles/filedetails/?id=3767639280).
+
+## Repository layout
+
+The repository root is the mod folder. It can be linked directly into `Zomboid/mods`:
+
+```text
+QuartmasterArrange/
+  common/
+  42.20/
+    mod.info
+    media/lua/...
+```
+
+From PowerShell, with the destination absent:
+
+```powershell
+New-Item -ItemType SymbolicLink -Path 'C:\Users\Hudson\Zomboid\mods\QuartermasterItemArrange' -Target 'C:\Users\Hudson\Git\QuartmasterArrange'
+```
+
+A physical copy of this mod was installed previously at that destination. Move it
+outside the mods folder before creating the link. Windows may require Developer
+Mode or an elevated shell for symbolic links.
+
+Alternatively, copy this repository's `common` and `42.20` folders into a single
+folder under `Zomboid/mods`. Keep them side by side; no additional nested mod folder
+is needed.
+
+## Use
+
+1. Enable **Quartermaster**, **Item Arrange**, and **Quartermaster - Item Arrange Compatibility** for the save, then restart the game.
+2. Right-click any container Quartermaster can configure and select **[ ] Item Arrange**. A checked option switches the mode off again.
+3. Use **Configure sorting...** to select its categories, specific items, presets and priority.
+4. Select **Distribute Loot**. Your character walks to the destination, faces its tile and uses Item Arrange's Shift-drop placement. You do not need to hold Shift or aim the mouse.
+
+The toggle is also available in Quartermaster's inventory context menu. Stacked
+objects and separate compartments can be marked independently. Normal destinations
+keep their usual container transfers.
+
+## Placement details
+
+- A marked container represents display space on its world tile. Item Arrange controls the final positions on the floor or furniture surfaces.
+- The container's internal weight capacity does not limit display deliveries. Available display space is checked when each item is delivered.
+- Blocked or full destinations, removed objects and failed loads are skipped without cancelling the remaining haul. Items stay in their source or carrier. Failed display deliveries are not automatically rerouted.
+- Item Arrange's item and surface support is unchanged. Unsupported items may become ordinary ground drops.
+- Compartments and objects sharing a tile share that tile's arrangement space. The toggle cannot select a particular shelf on the same tile.
+- Existing contents remain inside marked containers. Quartermaster still skips items already in their matching destination.
+- Displayed items are world items, so they do not count as container contents for Quartermaster's manifest or crafting-from-storage.
+- Marks are saved per compartment on the world object. Sorting copy/paste and presets do not copy the independent Item Arrange flag.
+
+## Multiplayer
+
+Install the mod on the server and every client. Add `QuartermasterItemArrange`
+after `Quartermaster` and `ItemArrange` in the server's `Mods` list. The required
+Workshop IDs are `3761216758` and `3767639280`. This add-on has no published
+Workshop ID.
+
+The server validates and saves marks. A shared timed action delegates placement to
+Item Arrange. Live multiplayer behavior still needs an in-game test.
+
+## Validation
+
+Built against Quartermaster **0.24.0** and Item Arrange **2.9**. Passed **17 offline
+Lua 5.1 integration scenarios** using their actual installed Lua implementations
+with mocked game objects, including a full sort queue with mixed destinations.
+Every shipping Lua file passed syntax compilation. The game and Java networking
+were not exercised.
+
+Start with one supported item delivered to a marked table or shelf, then try a
+mixed haul to both a marked display and a normal crate. Repeat on the intended
+multiplayer server before relying on it there.
diff --git a/common/.keep b/common/.keep
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/common/.keep
@@ -0,0 +1 @@
+