Board Thread:Support Requests - Getting Technical/@comment-37.228.244.184-20200805160705/@comment-168424-20200805185325

Anons are not allowed to see File: pages as per the link above.

I can't repro your problem (the larger image popup lightbox appears for me when I click an image thumbnail) in Chrome as an anon (not logged in), so either your description of the problem is wrong or you're leaving out some info.