Hi, we’ve just upgraded to 12.6 and now we have the strage issue:
User A is editing a page in chrome and adding some screenshots (made using Greenshot) just by copy-pasting. The attachments are named like image-202008281234-1.png (some timestamp) and saved automatically - everything OK.
User B does the same in firefox. But the attachments are stored as “grafik.png”. So if user B pastes more than one screenshot, every new screenshot is overwriting the old ones because of the same name. After saving, every “image” shows the same content. And the attachment-version counts up.
We don’t have versioned attachments, so we can’t restore this.
I don’t know if this is a xwiki-issue or a firefox one, but maybe you know how to fix this.