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Well ,android users would never pay for apps,as they can always find cracked version ,and that’s why ios apps are more developed and powerful.

there’s no way of restoring deleted frames,but you can import your video sequence if it was saved 

I’m sorry but apparently they developers can’t spare time supporting older verions. Have ever tried ios 12?

Yeah , I understand you. Yesterday I accidentally deleted some frames and realized could not get them back. The point is,without a timeline or something,it is difficult to locate my frame only by recognizing thumbnails at the bottom. 

Keyframes are needed in some simple movements. I don’t want to move and zoom  my background frame by frame 

This feature should be an urgent need,because when you copy and paste a lot of frames,it’s hard to differentiate between those frames.