I just bought Camera Bag from the AppStore, because I found the Photos extension on your feature list for version 2.8. Unfortunately, there is no extension in the system settings for Photos. Did you remove the extension in version 3 or is this a bug? Are you planning to add it back soon? Else I'd ask for a refund from the AppStore, as I don't work with photo apps without a photos extension anymore (and Camera Bag is not even compatible with the "External Editors" Photos extension).