My Aosu app version is 5.2.11. Possibly different versions of the app have different functionality but I am unable to delete more than one video at a time unless I subscribe to AosuProtect+. Also, I am unable to delete Activities or System messages. The total number of Activities and System messages add up quickly.
Again, I am pleased with the cameras (I have 2) but the functionality of the app leaves a great deal to be desired. Hopefully someone is paying attention to this forum and may make improvements to the app.