When I uploaded the last image in this post: https://pinside.com/pinball/forum/topic/cocktail-table-homebrew-theme-tbd#post-7032219, there are no buttons on the thumbnail, so I can't insert or delete it.
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Your browser/os information:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.0.0 Safari/537.36 (this will help us make sense of your bug report)