diff --git a/ai.go b/ai.go
index 470b43e..ef9180d 100644
--- a/ai.go
+++ b/ai.go
@@ -722,10 +722,12 @@ func ProcessDocument(filePath string) (*Document, error) {
 
 	log.Printf("  Category: %s, Type: %s", analysis.Category, analysis.DocType)
 
-	// Copy to store
+	// Copy to store (skip if already there — reprocessing from store-backed upload)
 	storePath := filepath.Join(storeDir, hash+ext)
-	if err := copyFile(filePath, storePath); err != nil {
-		return nil, fmt.Errorf("store copy failed: %w", err)
+	if _, statErr := os.Stat(storePath); os.IsNotExist(statErr) {
+		if err := copyFile(filePath, storePath); err != nil {
+			return nil, fmt.Errorf("store copy failed: %w", err)
+		}
 	}
 
 	// Only set PDFPath for actual PDFs — office/text files have no previewable PDF