Ok thank you.

I tried but nothing worked. I figured out what the problem was. It was not the forum nor my migration. It was the Plugin "WP Fastest Cache" which was ...

Thanks for your reply. I will check this.

Thanks for your reply and letting me know. I am looking forward.

Oh I just tested the Addon again and it seems that the media I uploaded yesterday is gone. I think it is not possible to use it as a usergallery. 😭