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Ok that’s strange. Do you have a screenshot?

Yes, but don’t see how to upload it here.

You can upload it to your media library and share a link here, for example

there is no upload paperclip visible, only to add a URL link

I have the same problem. I uninstalled the plugin, but the notice remains.

The WP support system does not permit attachments, so please see the screencap here.

Same problem here.
https://pasteboard.co/z0iYxQpVlhSS.png

Please do something. Thanks.