Thank you using our services.
The batch editor in images and documents module can only edit tags, not category. However this functionality also has a kind of a bug. It assigns selected tag only to the page of images currently displayed. For example if you are batch editing 30 images you will have 2 pages, and the tag will be assigned only to the displayed results. I have logged as a bug and it should be fixed in Sitefinity 3.7 SP4. I have also updated your telerik points.
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Public Issue Tracking
system and vote to affect the priority of the items.