bugfix(FIL-01 + files verschwunden nach hochladen und neuladen

src/hooks/useFiles.ts

@@ -480,7 +480,12 @@ export function useFileOperations() {
    * - Removed workflowId from FileItem creation in interfaceComponentObjects.py
    * - Upload should now work correctly
    */
-  const handleFileUpload = async (file: globalThis.File, workflowId?: string, featureInstanceId?: string) => {
+  const handleFileUpload = async (
+    file: globalThis.File,
+    workflowId?: string,
+    featureInstanceId?: string,
+    folderId?: string | null,
+  ) => {
     setUploadError(null);
     setUploadingFile(true);
     
@@ -504,6 +509,9 @@ export function useFileOperations() {
       if (featureInstanceId) {
         formData.append('featureInstanceId', featureInstanceId);
       }
+      if (folderId) {
+        formData.append('folderId', folderId);
+      }
       
       // FormData is now correctly configured for backend
       

src/pages/basedata/FilesPage.tsx

@@ -293,7 +293,7 @@ export const FilesPage: React.FC = () => {
       let successCount = 0;
       let errorCount = 0;
       for (const file of Array.from(picked)) {
-        const result = await handleFileUpload(file);
+        const result = await handleFileUpload(file, undefined, undefined, selectedFolderId);
         if (result?.success) successCount++; else errorCount++;
       }
       if (fileInputRef.current) fileInputRef.current.value = '';