diff --git a/app/api/routes/progressive_storage.py b/app/api/routes/progressive_storage.py
index 4c3f764..db9c731 100644
--- a/app/api/routes/progressive_storage.py
+++ b/app/api/routes/progressive_storage.py
@@ -34,6 +34,20 @@ async def s_api_v1_5_storage_post(request):
         make_log("uploader_v1.5", f"Invalid X-Content-SHA256 header format: {e}", level="ERROR")
         return response.json({"error": "Invalid X-Content-SHA256 header format"}, status=400)
     
+    existing = request.ctx.db_session.query(StoredContent).filter_by(hash=provided_hash_b58).first()
+    if existing:
+        make_log("uploader_v1.5", f"File with hash {provided_hash_b58} already exists in DB", level="INFO")
+        serialized_v2 = existing.cid.serialize_v2()  # Get v2 content id
+        serialized_v1 = existing.cid.serialize_v1()  # Get v1 content id
+        # Return early response since the file is already stored
+        return response.json({
+            "upload_id": request.headers.get("X-Upload-ID", str(uuid4())),  # Use provided or generate a new upload_id
+            "content_sha256": provided_hash_b58,
+            "content_id": serialized_v2,
+            "content_id_v1": serialized_v1,
+            "content_url": f"dmy://storage?cid={serialized_v2}",
+        })
+    
     # Get the provided file name from header and decode it from base64
     provided_filename_b64 = request.headers.get("X-File-Name")
     if not provided_filename_b64: