diff --git a/include/QtNodes/internal/DagGraphicsScene.hpp b/include/QtNodes/internal/DagGraphicsScene.hpp
index 7fcaaba9..51a63f89 100644
--- a/include/QtNodes/internal/DagGraphicsScene.hpp
+++ b/include/QtNodes/internal/DagGraphicsScene.hpp
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <QFileInfo>
+#include <QDir>
 
 #include "BasicGraphicsScene.hpp"
 #include "DirectedAcyclicGraphModel.hpp"
@@ -23,6 +24,8 @@ class NODE_EDITOR_PUBLIC DagGraphicsScene : public BasicGraphicsScene
     QMenu *createSceneMenu(QPointF const scenePos) override;
     bool isEmpty() const { return _graphModel.isEmpty(); }
     bool isBlank() const { return _graphModel.isEmpty(); }
+    QDir getDataDir() const;
+    void setDataDir(QDir const &dir);
 
 public Q_SLOTS:
     bool save(const QString &filePath, const QJsonObject &metadata = {}) const;
@@ -34,6 +37,7 @@ public Q_SLOTS:
 
 private:
     DirectedAcyclicGraphModel &_graphModel;
+    QDir _dataDir; // store current tab's data dir
 };
 
 } // namespace QtNodes
diff --git a/include/QtNodes/internal/UndoCommands.hpp b/include/QtNodes/internal/UndoCommands.hpp
index 7aed4d60..271520c0 100644
--- a/include/QtNodes/internal/UndoCommands.hpp
+++ b/include/QtNodes/internal/UndoCommands.hpp
@@ -3,9 +3,10 @@
 #include "Definitions.hpp"
 #include "Export.hpp"
 
+#include <QDir>
+#include <QUndoCommand>
 #include <QtCore/QJsonObject>
 #include <QtCore/QPointF>
-#include <QUndoCommand>
 
 #include <unordered_set>
 
@@ -61,11 +62,15 @@ class NODE_EDITOR_PUBLIC PasteCommand : public QUndoCommand
 private:
     QJsonObject takeSceneJsonFromClipboard();
     QJsonObject makeNewNodeIdsInScene(QJsonObject const &sceneJson);
+    void copyNodeDataFiles(const QJsonObject &sceneJson,
+                           const QDir &sourceDir,
+                           BasicGraphicsScene *scene);
 
 private:
     BasicGraphicsScene *_scene;
     QPointF const &_mouseScenePos;
     QJsonObject _newSceneJson;
+    QDir _sourceDataDir; // source data dir for paste operation
 };
 
 class NODE_EDITOR_PUBLIC DisconnectCommand : public QUndoCommand
diff --git a/src/DagGraphicsScene.cpp b/src/DagGraphicsScene.cpp
index 94c24e41..262f8435 100644
--- a/src/DagGraphicsScene.cpp
+++ b/src/DagGraphicsScene.cpp
@@ -202,4 +202,16 @@ void DagGraphicsScene::createNodeAt(const QString &name, const QPointF &pos)
     this->undoStack().push(new CreateCommand(this, name, pos));
 }
 
+QDir DagGraphicsScene::getDataDir() const
+{
+    if (_dataDir.exists())
+        return _dataDir;
+    return QDir();
+}
+
+void DagGraphicsScene::setDataDir(QDir const &dir)
+{
+    _dataDir = dir;
+}
+
 } // namespace QtNodes
diff --git a/src/UndoCommands.cpp b/src/UndoCommands.cpp
index c98289cf..1bfa71c9 100644
--- a/src/UndoCommands.cpp
+++ b/src/UndoCommands.cpp
@@ -3,6 +3,7 @@
 #include "BasicGraphicsScene.hpp"
 #include "ConnectionGraphicsObject.hpp"
 #include "ConnectionIdUtils.hpp"
+#include "DagGraphicsScene.hpp"
 #include "Definitions.hpp"
 #include "NodeGraphicsObject.hpp"
 
@@ -13,7 +14,6 @@
 #include <QtWidgets/QApplication>
 #include <QtWidgets/QGraphicsObject>
 
-
 namespace QtNodes {
 
 static QJsonObject serializeSelectedItems(BasicGraphicsScene *scene)
@@ -240,10 +240,17 @@ CopyCommand::CopyCommand(BasicGraphicsScene *scene)
         setObsolete(true);
         return;
     }
+    // For copy-paste data: include the data path (sourceDir) in the scene
+    QJsonObject wrapper;
+    wrapper["scene"] = sceneJson;
+    if (auto dagScene = dynamic_cast<DagGraphicsScene *>(scene)) {
+        if (auto srcDir = dagScene->getDataDir(); srcDir.exists())
+            wrapper["sourceDir"] = srcDir.absolutePath();
+    }
 
     QClipboard *clipboard = QApplication::clipboard();
 
-    QByteArray const data = QJsonDocument(sceneJson).toJson();
+    QByteArray const data = QJsonDocument(wrapper).toJson();
 
     QMimeData *mimeData = new QMimeData();
     mimeData->setData("application/qt-nodes-graph", data);
@@ -263,7 +270,12 @@ PasteCommand::PasteCommand(BasicGraphicsScene *scene, QPointF const &mouseSceneP
     : _scene(scene)
     , _mouseScenePos(mouseScenePos)
 {
-    _newSceneJson = takeSceneJsonFromClipboard();
+    QJsonObject wrapper = takeSceneJsonFromClipboard();
+    // check if sourcDir key exists in wrapper
+    _sourceDataDir = QDir();
+    if (wrapper.contains("sourceDir"))
+        _sourceDataDir = QDir(wrapper["sourceDir"].toString());
+    _newSceneJson = wrapper["scene"].toObject();
 
     if (_newSceneJson.empty() || _newSceneJson["nodes"].toArray().empty()) {
         setObsolete(true);
@@ -288,6 +300,7 @@ void PasteCommand::redo()
 
     // Ignore if pasted in content does not generate nodes.
     try {
+        copyNodeDataFiles(_newSceneJson, _sourceDataDir, _scene);
         insertSerializedItems(_newSceneJson, _scene);
     } catch (...) {
         // If the paste does not work, delete all selected nodes and connections
@@ -305,6 +318,40 @@ void PasteCommand::redo()
     }
 }
 
+void PasteCommand::copyNodeDataFiles(const QJsonObject &sceneJson,
+                                     const QDir &sourceDir,
+                                     BasicGraphicsScene *scene)
+{
+    QDir targetDir;
+    if (auto dagScene = dynamic_cast<DagGraphicsScene *>(scene)) {
+        targetDir = dagScene->getDataDir();
+    }
+
+    QJsonArray nodesJsonArray = sceneJson["nodes"].toArray();
+    for (const auto &nodeVal : nodesJsonArray) {
+        QJsonObject obj = nodeVal.toObject();
+        QJsonObject internalData = obj["internal-data"].toObject();
+
+        // check if data/function source model exists in the scene, to copy the files
+        QString fileName;
+        if (internalData.contains("data-name"))
+            fileName = internalData["data-name"].toString();
+        else if (internalData.contains("saved_function"))
+            fileName = internalData["saved_function"].toString();
+
+        if (!fileName.isEmpty()) {
+            QString srcPath = sourceDir.filePath(fileName);
+            QString targetPath = targetDir.filePath(fileName);
+
+            if (QFile::exists(srcPath) && !QFile::exists(targetPath)) {
+                QFile::copy(srcPath, targetPath);
+            } else {
+                qWarning() << "Failed to copy file from" << srcPath << "to" << targetPath;
+            }
+        }
+    }
+}
+
 QJsonObject PasteCommand::takeSceneJsonFromClipboard()
 {
     QClipboard const *clipboard = QApplication::clipboard();