[STG] Fix download file for stg/dev env (#4423)

* fix download file

* mypy

* upd download

* upd

src/hct_mis_api/apps/payment/api/views.py

@@ -210,7 +210,10 @@ def destroy(self, request: Request, *args: Any, **kwargs: Any) -> Response:
     @action(detail=True, methods=["get"])
     def download(self, request: Request, *args: Any, **kwargs: Any) -> FileResponse:
         document = self.get_object()
-        file_mimetype, _ = mimetypes.guess_type(document.file.path)
-        response = FileResponse(document.file.open(), content_type=file_mimetype or "application/octet-stream")
-        response["Content-Disposition"] = f"attachment; filename={document.file.name.split('/')[-1]}"
+        file = document.file
+        file_mimetype, _ = mimetypes.guess_type(file.url)
+        response = FileResponse(
+            file.open(), as_attachment=True, content_type=file_mimetype or "application/octet-stream"
+        )
+        response["Content-Disposition"] = f"attachment; filename={file.name.split('/')[-1]}"
         return response