SessionId->5ac2f88f-ca50-49e8-8b05-38a889af8a12->/diagram/merger/api/merger?outputType=GIF->Joyeux-Noel.gif is invalid file, please ensure that uploading correct file
Please share a problematic file and we’ll look into this issue.
The file you upload is gif format, and the app currently only supports uploading visio format files.
If you want to merge two pictures, you can use this app(Free Online Merge Images, Photos, Pictures with High output Quality)