diff --git a/src/jasper/modules/world/src/studio/worldobjectseteditor/commands/addpalette.cpp b/src/jasper/modules/world/src/studio/worldobjectseteditor/commands/addpalette.cpp
index 1fb8711..95bc2ac 100644
--- a/src/jasper/modules/world/src/studio/worldobjectseteditor/commands/addpalette.cpp
+++ b/src/jasper/modules/world/src/studio/worldobjectseteditor/commands/addpalette.cpp
@@ -7,19 +7,24 @@
 #include "commands.hpp"
 #include "addpalette.hpp"
 
+#include <keel/media.hpp>
+
 namespace jasper::world {
 
-AddPalette::AddPalette(WorldObjectSet &doc, ox::FileAddress palAddr) noexcept:
-	m_doc(doc),
-	m_palAddr(std::move(palAddr)) {
+AddPalette::AddPalette(WorldObjectSet &doc, ox::FileAddress palAddr, keel::Context &kctx) noexcept:
+	m_doc{doc},
+	m_palAddr{std::move(palAddr)},
+	m_kctx{kctx} {
 }
 
 ox::Error AddPalette::redo() noexcept {
 	m_doc.palettes.emplace_back(m_palAddr);
-	std::sort(m_doc.palettes.begin(), m_doc.palettes.end(),
-		[](ox::FileAddress const&a, ox::FileAddress const&b) {
-			return a.getPath().or_value("") < b.getPath().or_value("");
-		});
+	//std::sort(m_doc.palettes.begin(), m_doc.palettes.end(),
+	//	[this](ox::FileAddress const&a, ox::FileAddress const&b) {
+	//		auto const aPath = uuidUrlToPath(m_kctx, a.getPath().or_value("")).or_value("");
+	//		auto const bPath = uuidUrlToPath(m_kctx, b.getPath().or_value("")).or_value("");
+	//		return aPath < bPath;
+	//	});
 	return {};
 }
 
diff --git a/src/jasper/modules/world/src/studio/worldobjectseteditor/commands/addpalette.hpp b/src/jasper/modules/world/src/studio/worldobjectseteditor/commands/addpalette.hpp
index 22c1113..23fbf0f 100644
--- a/src/jasper/modules/world/src/studio/worldobjectseteditor/commands/addpalette.hpp
+++ b/src/jasper/modules/world/src/studio/worldobjectseteditor/commands/addpalette.hpp
@@ -16,8 +16,9 @@ class AddPalette: public studio::UndoCommand {
 	private:
 		WorldObjectSet &m_doc;
 		ox::FileAddress m_palAddr;
+		keel::Context &m_kctx;
 	public:
-		AddPalette(WorldObjectSet &doc, ox::FileAddress palAddr) noexcept;
+		AddPalette(WorldObjectSet &doc, ox::FileAddress palAddr, keel::Context &kctx) noexcept;
 		ox::Error redo() noexcept override;
 		ox::Error undo() noexcept override;
 		[[nodiscard]]
diff --git a/src/jasper/modules/world/src/studio/worldobjectseteditor/commands/changetilesheet.cpp b/src/jasper/modules/world/src/studio/worldobjectseteditor/commands/changetilesheet.cpp
index 7d6381f..aa98b99 100644
--- a/src/jasper/modules/world/src/studio/worldobjectseteditor/commands/changetilesheet.cpp
+++ b/src/jasper/modules/world/src/studio/worldobjectseteditor/commands/changetilesheet.cpp
@@ -5,36 +5,39 @@
 #include "commands.hpp"
 #include "changetilesheet.hpp"
 
+#include <utility>
+#include <keel/media.hpp>
+
 namespace jasper::world {
 
 ChangeTileSheet::ChangeTileSheet(
+		keel::Context &kctx,
 		WorldObjectSet &doc,
 		ox::FileAddress newVal,
-		size_t newIdx,
-		size_t &selectedTilesheetIdx) noexcept:
+		ox::String &path) noexcept:
+	m_kctx{kctx},
 	m_doc(doc),
-	m_newVal(std::move(newVal)),
-	m_oldIdx(selectedTilesheetIdx),
-	m_newIdx(newIdx),
-	m_selectedTilesheetIdx(selectedTilesheetIdx) {
+	m_valAlt(std::move(newVal)),
+	m_selectedTilesheet(path) {
 }
 
 ox::Error ChangeTileSheet::redo() noexcept {
-	m_oldVal = std::move(m_doc.tilesheet);
-	m_doc.tilesheet = std::move(m_newVal);
-	m_selectedTilesheetIdx = m_newIdx;
-	return {};
+	return swap();
 }
 
 ox::Error ChangeTileSheet::undo() noexcept {
-	m_newVal = std::move(m_doc.tilesheet);
-	m_doc.tilesheet = std::move(m_oldVal);
-	m_selectedTilesheetIdx = m_oldIdx;
-	return {};
+	return swap();
 }
 
 int ChangeTileSheet::commandId() const noexcept {
 	return static_cast<int>(WorldObjCommand::ChangeTileSheet);
 }
 
+ox::Error ChangeTileSheet::swap() noexcept {
+	std::swap(m_doc.tilesheet, m_valAlt);
+	OX_REQUIRE_M(path, m_doc.tilesheet.getPath());
+	m_selectedTilesheet = keel::uuidUrlToPath(m_kctx, path).or_value(path);
+	return {};
+}
+
 }
diff --git a/src/jasper/modules/world/src/studio/worldobjectseteditor/commands/changetilesheet.hpp b/src/jasper/modules/world/src/studio/worldobjectseteditor/commands/changetilesheet.hpp
index 4e6c107..865da6c 100644
--- a/src/jasper/modules/world/src/studio/worldobjectseteditor/commands/changetilesheet.hpp
+++ b/src/jasper/modules/world/src/studio/worldobjectseteditor/commands/changetilesheet.hpp
@@ -14,22 +14,23 @@ namespace jasper::world {
 
 class ChangeTileSheet: public studio::UndoCommand {
 	private:
+		keel::Context &m_kctx;
 		WorldObjectSet &m_doc;
-		ox::FileAddress m_newVal;
-		ox::FileAddress m_oldVal;
-		size_t m_oldIdx{};
-		size_t m_newIdx{};
-		size_t &m_selectedTilesheetIdx;
+		ox::FileAddress m_valAlt;
+		ox::String &m_selectedTilesheet;
 	public:
 		ChangeTileSheet(
-				 WorldObjectSet &doc,
-				 ox::FileAddress newVal,
-				 size_t newIdx,
-				 size_t &selectedTilesheetIdx) noexcept;
+				keel::Context &kctx,
+				WorldObjectSet &doc,
+				ox::FileAddress newVal,
+				ox::String &path) noexcept;
 		ox::Error redo() noexcept override;
 		ox::Error undo() noexcept override;
 		[[nodiscard]]
 		int commandId() const noexcept override;
+
+	private:
+		ox::Error swap() noexcept;
 };
 
 }
diff --git a/src/jasper/modules/world/src/studio/worldobjectseteditor/worldobjectseteditor-imgui.cpp b/src/jasper/modules/world/src/studio/worldobjectseteditor/worldobjectseteditor-imgui.cpp
index 6c53b05..1701f69 100644
--- a/src/jasper/modules/world/src/studio/worldobjectseteditor/worldobjectseteditor-imgui.cpp
+++ b/src/jasper/modules/world/src/studio/worldobjectseteditor/worldobjectseteditor-imgui.cpp
@@ -29,11 +29,10 @@ WorldObjectSetEditorImGui::WorldObjectSetEditorImGui(
 	m_itemPath(itemPath()),
 	m_doc(*readObj<WorldObjectSet>(keelCtx(m_sctx), itemPath()).unwrapThrow()),
 	m_tileSheet(readObj<ncore::TileSheet>(keelCtx(m_sctx), m_doc.tilesheet).unwrapThrow()) {
-	auto const&tilesheetList = m_sctx.project->fileList(ncore::FileExt_ng);
 	auto &kctx = keelCtx(m_sctx);
 	auto const [tsPath, err] = getPath(kctx, m_doc.tilesheet);
 	if (!err) {
-		m_selectedTilesheetIdx = std::find(tilesheetList.begin(), tilesheetList.end(), tsPath).offset();
+		m_tilesheetPath = tsPath;
 	}
 	loadObj();
 	undoStack()->changeTriggered.connect(this, &WorldObjectSetEditorImGui::handleCmd);
@@ -91,16 +90,12 @@ void WorldObjectSetEditorImGui::buildPaletteDisplayNameList() noexcept {
 }
 
 void WorldObjectSetEditorImGui::drawTileSheetSelector() noexcept {
-	auto const&tilesheetList = m_sctx.project->fileList(ncore::FileExt_ng);
-	auto sel = m_selectedTilesheetIdx;
-	if (ig::ComboBox("Tile Sheet", tilesheetList, sel)) {
-		auto const [uuid, err] = keel::pathToUuid(
-				keelCtx(m_sctx.tctx), tilesheetList[sel]);
+	auto constexpr tsFlags = ImGuiInputTextFlags_ReadOnly;
+	ig::InputText("Tile Sheet", m_tilesheetPath, tsFlags);
+	if (ig::DragDropTarget const d; d) {
+		auto const [fr, err] = ig::getDragDropPayload<studio::FileRef>("FileRef");
 		if (!err) {
-			auto const uuidUrl = ox::sfmt("uuid://{}", uuid.toString());
-			std::ignore = pushCommand<ChangeTileSheet>
-					(m_doc, ox::FileAddress(uuidUrl), sel, m_selectedTilesheetIdx);
-			loadObj();
+			std::ignore = setTileSheet(fr.path);
 		}
 	}
 }
@@ -287,6 +282,17 @@ void WorldObjectSetEditorImGui::drawPaletteList() noexcept {
 		drawPaletteListItems();
 		ImGui::EndTable();
 	}
+	if (ig::DragDropTarget const d; d) {
+		auto const [fr, err] = ig::getDragDropPayload<studio::FileRef>("FileRef");
+		if (!err) {
+			auto const [uuid, err] = keel::pathToUuid(
+					keelCtx(m_sctx), fr.path);
+			if (!err) {
+				auto const uuidUrl = ox::sfmt("uuid://{}", uuid.toString());
+				std::ignore = pushCommand<AddPalette>(m_doc, ox::FileAddress{uuidUrl}, keelCtx(m_sctx));
+			}
+		}
+	}
 }
 
 void WorldObjectSetEditorImGui::drawPaletteListItems() noexcept {
@@ -320,7 +326,7 @@ void WorldObjectSetEditorImGui::drawAddPalettePopup() noexcept {
 					keelCtx(m_sctx.tctx), palettes[m_addPalPopup.selectedIdx]);
 			if (!err) {
 				auto const uuidUrl = ox::sfmt("uuid://{}", uuid.toString());
-				std::ignore = pushCommand<AddPalette>(m_doc, ox::FileAddress(uuidUrl));
+				std::ignore = pushCommand<AddPalette>(m_doc, ox::FileAddress{uuidUrl}, keelCtx(m_sctx));
 			}
 		}
 		ImGui::EndPopup();
@@ -336,6 +342,16 @@ void WorldObjectSetEditorImGui::rmPalette() noexcept {
 	std::ignore = pushCommand<RmPalette>(m_doc, m_selectedPal);
 }
 
+ox::Error WorldObjectSetEditorImGui::setTileSheet(ox::StringViewCR path) noexcept {
+	auto const [uuid, err] = keel::pathToUuid(
+			keelCtx(m_sctx), path);
+	auto const uuidUrl = ox::sfmt("uuid://{}", uuid.toString());
+	std::ignore = pushCommand<ChangeTileSheet>
+			(keelCtx(m_sctx), m_doc, ox::FileAddress{uuidUrl}, m_tilesheetPath);
+	loadObj();
+	return {};
+}
+
 ox::Error WorldObjectSetEditorImGui::handleCmd(studio::UndoCommand const*cmd) noexcept {
 	if (dynamic_cast<ChangeTileSheet const*>(cmd)) {
 		auto &kctx = keelCtx(m_sctx.tctx);
diff --git a/src/jasper/modules/world/src/studio/worldobjectseteditor/worldobjectseteditor-imgui.hpp b/src/jasper/modules/world/src/studio/worldobjectseteditor/worldobjectseteditor-imgui.hpp
index 9eee73a..f8f159a 100644
--- a/src/jasper/modules/world/src/studio/worldobjectseteditor/worldobjectseteditor-imgui.hpp
+++ b/src/jasper/modules/world/src/studio/worldobjectseteditor/worldobjectseteditor-imgui.hpp
@@ -23,7 +23,7 @@ class WorldObjectSetEditorImGui: public studio::Editor {
 		ox::Vector<ox::String> m_paletteDisplayNames;
 		size_t m_selectedObj{};
 		size_t m_selectedPal{};
-		size_t m_selectedTilesheetIdx{};
+		ox::String m_tilesheetPath{};
 		struct {
 			bool show{};
 			size_t selectedIdx{};
@@ -70,6 +70,8 @@ class WorldObjectSetEditorImGui: public studio::Editor {
 
 		void rmPalette() noexcept;
 
+		ox::Error setTileSheet(ox::StringViewCR path) noexcept;
+
 		ox::Error handleCmd(studio::UndoCommand const*cmd) noexcept;
 
 		ox::Error saveItem() noexcept final;