diff --git a/frontend/src/App.jsx b/frontend/src/App.jsx
index a89b236..c3662ba 100644
--- a/frontend/src/App.jsx
+++ b/frontend/src/App.jsx
@@ -18,6 +18,7 @@ import { hydrateWorkflowState } from './workflowHydration';
 import { serializeWorkflowState } from './workflowSerialization';
 import {
   buildNodeClipboardPayload,
+  buildNodeClipboardPayloadForIds,
   instantiateNodeClipboardPayload,
   NODE_CLIPBOARD_MIME,
   parseNodeClipboardPayload,
@@ -472,6 +473,7 @@ function Flow() {
   const defaultWorkflowLoadAttemptedRef = useRef(false);
   const lastPastedClipboardTextRef = useRef('');
   const pasteRepeatCountRef = useRef(0);
+  const duplicateDragRef = useRef(null);
   const reactFlow = useReactFlow();
 
   // ── WebSocket ───────────────────────────────────────────────────────
@@ -980,6 +982,29 @@ function Flow() {
     }
   }, [setNodes, scheduleAutoRun]);
 
+  const initializeDynamicNodes = useCallback((nodesToInitialize) => {
+    setTimeout(() => {
+      nodesToInitialize.forEach((node) => {
+        if (node.data.className === 'Folder' && node.data.widgetValues?.folder) {
+          refreshFolderNodeOutputs(node.id, node.data.widgetValues.folder);
+        }
+      });
+      nodesToInitialize.forEach((node) => {
+        if (node.data.className === 'Image' || node.data.className === 'ImageDemo') {
+          refreshLoadNodeOutputs(node.id);
+        }
+      });
+      nodesToInitialize.forEach((node) => {
+        if (node.data.className === 'Annotations' || node.data.className === 'Markup') {
+          refreshAnnotationNodeOutputs(node.id);
+        }
+      });
+      nodesToInitialize.forEach((node) => {
+        reactFlow.updateNodeInternals(node.id);
+      });
+    }, 0);
+  }, [reactFlow, refreshAnnotationNodeOutputs, refreshFolderNodeOutputs, refreshLoadNodeOutputs]);
+
   const pasteClipboardSelection = useCallback((clipboardText) => {
     const payload = parseNodeClipboardPayload(clipboardText);
     if (!payload) return false;
@@ -1012,26 +1037,7 @@ function Flow() {
       ...pasted.edges,
     ]);
 
-    setTimeout(() => {
-      pasted.nodes.forEach((node) => {
-        if (node.data.className === 'Folder' && node.data.widgetValues?.folder) {
-          refreshFolderNodeOutputs(node.id, node.data.widgetValues.folder);
-        }
-      });
-      pasted.nodes.forEach((node) => {
-        if (node.data.className === 'Image' || node.data.className === 'ImageDemo') {
-          refreshLoadNodeOutputs(node.id);
-        }
-      });
-      pasted.nodes.forEach((node) => {
-        if (node.data.className === 'Annotations' || node.data.className === 'Markup') {
-          refreshAnnotationNodeOutputs(node.id);
-        }
-      });
-      pasted.nodes.forEach((node) => {
-        reactFlow.updateNodeInternals(node.id);
-      });
-    }, 0);
+    initializeDynamicNodes(pasted.nodes);
 
     setStatus({
       text: `Pasted ${pasted.nodes.length} node${pasted.nodes.length === 1 ? '' : 's'}.`,
@@ -1040,10 +1046,8 @@ function Flow() {
     scheduleAutoRun();
     return true;
   }, [
+    initializeDynamicNodes,
     reactFlow,
-    refreshAnnotationNodeOutputs,
-    refreshFolderNodeOutputs,
-    refreshLoadNodeOutputs,
     scheduleAutoRun,
     setEdges,
     setNodes,
@@ -1068,24 +1072,8 @@ function Flow() {
     setNodes(hydrated.nodes);
     setEdges(hydrated.edges);
     nextIdRef.current = hydrated.nextNodeId;
-    setTimeout(() => {
-      hydrated.nodes.forEach((node) => {
-        if (node.data.className === 'Folder' && node.data.widgetValues?.folder) {
-          refreshFolderNodeOutputs(node.id, node.data.widgetValues.folder);
-        }
-      });
-      hydrated.nodes.forEach((node) => {
-        if (node.data.className === 'Image' || node.data.className === 'ImageDemo') {
-          refreshLoadNodeOutputs(node.id);
-        }
-      });
-      hydrated.nodes.forEach((node) => {
-        if (node.data.className === 'Annotations' || node.data.className === 'Markup') {
-          refreshAnnotationNodeOutputs(node.id);
-        }
-      });
-    }, 0);
-  }, [refreshAnnotationNodeOutputs, refreshFolderNodeOutputs, refreshLoadNodeOutputs, setNodes, setEdges]);
+    initializeDynamicNodes(hydrated.nodes);
+  }, [initializeDynamicNodes, setNodes, setEdges]);
 
   const loadDefaultWorkflow = useCallback(async () => {
     if (defaultWorkflowLoadAttemptedRef.current) return;
@@ -1309,6 +1297,99 @@ function Flow() {
     }
   }, []);
 
+  const onNodeDragStart = useCallback((event, node) => {
+    if (!(event.ctrlKey || event.metaKey)) {
+      duplicateDragRef.current = null;
+      return;
+    }
+
+    const currentNodes = reactFlow.getNodes();
+    const draggedNodes = node.selected
+      ? currentNodes.filter((candidate) => candidate.selected)
+      : currentNodes.filter((candidate) => candidate.id === node.id);
+    if (draggedNodes.length === 0) return;
+
+    const draggedIds = draggedNodes.map((candidate) => String(candidate.id));
+    const payload = buildNodeClipboardPayloadForIds(
+      currentNodes,
+      reactFlow.getEdges(),
+      draggedIds,
+      { includeIncomingExternalEdges: true },
+    );
+    if (!payload) return;
+
+    duplicateDragRef.current = {
+      draggedIds,
+      originPositions: Object.fromEntries(
+        draggedNodes.map((candidate) => [
+          String(candidate.id),
+          {
+            x: Number(candidate.position?.x) || 0,
+            y: Number(candidate.position?.y) || 0,
+          },
+        ]),
+      ),
+      payload,
+    };
+  }, [reactFlow]);
+
+  const onNodeDragStop = useCallback((_event, node) => {
+    const duplicateState = duplicateDragRef.current;
+    duplicateDragRef.current = null;
+    if (!duplicateState) return;
+
+    const currentNodes = reactFlow.getNodes();
+    const anchorId = duplicateState.draggedIds.includes(String(node.id))
+      ? String(node.id)
+      : duplicateState.draggedIds[0];
+    const anchorNode = currentNodes.find((candidate) => String(candidate.id) === anchorId);
+    const anchorOrigin = duplicateState.originPositions[anchorId];
+    if (!anchorNode || !anchorOrigin) return;
+
+    const offset = {
+      x: (Number(anchorNode.position?.x) || 0) - anchorOrigin.x,
+      y: (Number(anchorNode.position?.y) || 0) - anchorOrigin.y,
+    };
+
+    const duplicated = instantiateNodeClipboardPayload(
+      duplicateState.payload,
+      nodeDefsRef.current,
+      nextIdRef.current,
+      offset,
+      { keepExternalSources: true },
+    );
+    if (duplicated.nodes.length === 0) return;
+
+    nextIdRef.current = duplicated.nextNodeId;
+    const draggedIdSet = new Set(duplicateState.draggedIds);
+
+    setNodes((existing) => [
+      ...existing.map((candidate) => {
+        const originalPosition = duplicateState.originPositions[String(candidate.id)];
+        if (!draggedIdSet.has(String(candidate.id)) || !originalPosition) {
+          return { ...candidate, selected: false };
+        }
+        return {
+          ...candidate,
+          selected: false,
+          position: originalPosition,
+        };
+      }),
+      ...duplicated.nodes,
+    ]);
+    setEdges((existing) => [
+      ...existing.map((edge) => ({ ...edge, selected: false })),
+      ...duplicated.edges,
+    ]);
+
+    initializeDynamicNodes(duplicated.nodes);
+    setStatus({
+      text: `Duplicated ${duplicated.nodes.length} node${duplicated.nodes.length === 1 ? '' : 's'}.`,
+      level: 'info',
+    });
+    scheduleAutoRun();
+  }, [initializeDynamicNodes, reactFlow, scheduleAutoRun, setEdges, setNodes]);
+
   // ── Keyboard shortcut ───────────────────────────────────────────────
 
   useEffect(() => {
@@ -1420,12 +1501,15 @@ function Flow() {
             edges={edges}
             onNodesChange={onNodesChange}
             onEdgesChange={handleEdgesChange}
+            onNodeDragStart={onNodeDragStart}
+            onNodeDragStop={onNodeDragStop}
             onConnect={onConnect}
             onConnectEnd={onConnectEnd}
             isValidConnection={isValidConnection}
             nodeTypes={NODE_TYPES}
             onPaneContextMenu={onPaneContextMenu}
             colorMode="dark"
+            multiSelectionKeyCode={['Shift']}
             deleteKeyCode={['Backspace', 'Delete']}
             defaultEdgeOptions={{ type: 'default' }}
           >
diff --git a/frontend/src/nodeClipboard.js b/frontend/src/nodeClipboard.js
index b87e533..b00506f 100644
--- a/frontend/src/nodeClipboard.js
+++ b/frontend/src/nodeClipboard.js
@@ -18,13 +18,26 @@ function clonePlainObject(value) {
   return cloneValue(value) || {};
 }
 
-export function buildNodeClipboardPayload(nodes, edges) {
-  const selectedNodes = Array.isArray(nodes) ? nodes.filter((node) => node?.selected) : [];
+export function buildNodeClipboardPayloadForIds(
+  nodes,
+  edges,
+  nodeIds,
+  { includeIncomingExternalEdges = false } = {},
+) {
+  const selectedIdSet = new Set((Array.isArray(nodeIds) ? nodeIds : []).map((id) => String(id)));
+  const selectedNodes = Array.isArray(nodes)
+    ? nodes.filter((node) => selectedIdSet.has(String(node.id)))
+    : [];
   if (selectedNodes.length === 0) return null;
 
-  const selectedIds = new Set(selectedNodes.map((node) => String(node.id)));
-  const internalEdges = Array.isArray(edges)
-    ? edges.filter((edge) => selectedIds.has(String(edge.source)) && selectedIds.has(String(edge.target)))
+  const capturedEdges = Array.isArray(edges)
+    ? edges.filter((edge) => (
+      selectedIdSet.has(String(edge.target))
+      && (
+        selectedIdSet.has(String(edge.source))
+        || (includeIncomingExternalEdges && !selectedIdSet.has(String(edge.source)))
+      )
+    ))
     : [];
 
   return {
@@ -45,7 +58,7 @@ export function buildNodeClipboardPayload(nodes, edges) {
         runtimeValues: clonePlainObject(node.data?.runtimeValues),
       },
     })),
-    edges: internalEdges.map((edge) => ({
+    edges: capturedEdges.map((edge) => ({
       source: String(edge.source),
       sourceHandle: edge.sourceHandle,
       target: String(edge.target),
@@ -55,6 +68,13 @@ export function buildNodeClipboardPayload(nodes, edges) {
   };
 }
 
+export function buildNodeClipboardPayload(nodes, edges) {
+  const selectedIds = Array.isArray(nodes)
+    ? nodes.filter((node) => node?.selected).map((node) => String(node.id))
+    : [];
+  return buildNodeClipboardPayloadForIds(nodes, edges, selectedIds);
+}
+
 export function parseNodeClipboardPayload(text) {
   if (typeof text !== 'string' || !text.trim()) return null;
 
@@ -68,7 +88,13 @@ export function parseNodeClipboardPayload(text) {
   }
 }
 
-export function instantiateNodeClipboardPayload(payload, defs = {}, nextNodeId = 1, offset = { x: 40, y: 40 }) {
+export function instantiateNodeClipboardPayload(
+  payload,
+  defs = {},
+  nextNodeId = 1,
+  offset = { x: 40, y: 40 },
+  { keepExternalSources = false } = {},
+) {
   if (!payload || !Array.isArray(payload.nodes) || payload.nodes.length === 0) {
     return { nodes: [], edges: [], nextNodeId };
   }
@@ -109,10 +135,13 @@ export function instantiateNodeClipboardPayload(payload, defs = {}, nextNodeId =
   });
 
   const edges = payload.edges
-    .filter((edge) => idMap.has(String(edge.source)) && idMap.has(String(edge.target)))
+    .filter((edge) => (
+      idMap.has(String(edge.target))
+      && (idMap.has(String(edge.source)) || keepExternalSources)
+    ))
     .map((edge, index) => ({
-      id: `e${idMap.get(String(edge.source))}-${idMap.get(String(edge.target))}-${index}`,
-      source: idMap.get(String(edge.source)),
+      id: `e${idMap.get(String(edge.source)) || String(edge.source)}-${idMap.get(String(edge.target))}-${index}`,
+      source: idMap.get(String(edge.source)) || String(edge.source),
       sourceHandle: edge.sourceHandle,
       target: idMap.get(String(edge.target)),
       targetHandle: edge.targetHandle,
diff --git a/frontend/tests/nodeClipboard.test.mjs b/frontend/tests/nodeClipboard.test.mjs
index 7ea25b0..682ba4f 100644
--- a/frontend/tests/nodeClipboard.test.mjs
+++ b/frontend/tests/nodeClipboard.test.mjs
@@ -3,6 +3,7 @@ import assert from 'node:assert/strict';
 
 import {
   buildNodeClipboardPayload,
+  buildNodeClipboardPayloadForIds,
   instantiateNodeClipboardPayload,
   NODE_CLIPBOARD_KIND,
   parseNodeClipboardPayload,
@@ -147,6 +148,93 @@ test('instantiateNodeClipboardPayload remaps ids, offsets positions, and hydrate
   ]);
 });
 
+test('buildNodeClipboardPayloadForIds can include upstream external edges for duplicated nodes', () => {
+  const nodes = [
+    { id: '1', position: { x: 0, y: 0 }, data: { className: 'Image' } },
+    { id: '2', position: { x: 100, y: 0 }, data: { className: 'Preview' } },
+    { id: '3', position: { x: 200, y: 0 }, data: { className: 'Save' } },
+  ];
+
+  const edges = [
+    {
+      source: '1',
+      sourceHandle: 'output::0::DATA_FIELD',
+      target: '2',
+      targetHandle: 'input::field::DATA_FIELD',
+    },
+    {
+      source: '2',
+      sourceHandle: 'output::0::IMAGE',
+      target: '3',
+      targetHandle: 'input::value::SAVE_VALUE',
+    },
+  ];
+
+  const payload = buildNodeClipboardPayloadForIds(nodes, edges, ['2'], {
+    includeIncomingExternalEdges: true,
+  });
+
+  assert.equal(payload.nodes.length, 1);
+  assert.deepEqual(payload.edges, [
+    {
+      source: '1',
+      sourceHandle: 'output::0::DATA_FIELD',
+      target: '2',
+      targetHandle: 'input::field::DATA_FIELD',
+    },
+  ]);
+});
+
+test('instantiateNodeClipboardPayload can keep external upstream sources when duplicating nodes', () => {
+  const payload = {
+    kind: NODE_CLIPBOARD_KIND,
+    version: 1,
+    nodes: [
+      {
+        id: '2',
+        position: { x: 100, y: 0 },
+        data: {
+          label: 'Preview',
+          className: 'Preview',
+          widgetValues: { colormap: 'viridis' },
+        },
+      },
+    ],
+    edges: [
+      {
+        source: '1',
+        sourceHandle: 'output::0::DATA_FIELD',
+        target: '2',
+        targetHandle: 'input::field::DATA_FIELD',
+      },
+    ],
+  };
+
+  const defs = {
+    Preview: { output: ['IMAGE'], output_name: ['preview'] },
+  };
+
+  const instantiated = instantiateNodeClipboardPayload(
+    payload,
+    defs,
+    7,
+    { x: 50, y: 25 },
+    { keepExternalSources: true },
+  );
+
+  assert.deepEqual(instantiated.nodes.map((node) => node.id), ['7']);
+  assert.deepEqual(instantiated.edges, [
+    {
+      id: 'e1-7-0',
+      source: '1',
+      sourceHandle: 'output::0::DATA_FIELD',
+      target: '7',
+      targetHandle: 'input::field::DATA_FIELD',
+      selected: false,
+    },
+  ]);
+});
+
 test('clipboard payload deep-copies local widget and runtime fields', () => {
   const nodes = [
     {