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To my knowledge, there's no electronic trail of what's done on the phone if it does not involve communications. The way flash memory works is that there's no way to figure out whether something was recorded and deleted or if no recording was made in the first place. And if something was deleted, there's no way to find out who did it or when.

I have first-hand knowledge.

Android phones at least for some reason keep hidden files of the group of thumbnails created every time you decide you want to look at pictures and video. This would show at least that there was some kind of movie there.

As to flash memory, it's invariably treated like a DOS hard drive, and the same tools you can use to (sometimes) recover "deleted" files from a DOS hard drive can be used on USB flash drives and the flash memory in a phone as well.

A second strategy for recovering something stored and deleted would be to try to recover the file at the level that the flash memory controller wrote it, not at the level that DOS wrote it. That would be very specialized work to be done by the manufacturer.

I have first-hand knowledge.
Android phones at least for some reason keep hidden files of the group of thumbnails created every time you decide you want to look at pictures and video. This would show at least that there was some kind of movie there.
As to flash memory, it's invariably treated like a DOS hard drive, and the same tools you can use to (sometimes) recover "deleted" files from a DOS hard drive can be used on USB flash drives and the flash memory in a phone as well.

Thanks for the tips. I had thought that flash drives were a special case and that everything deleted went to bit heaven. My experience is that stuff deleted from flash cards or USB flash drives don't show up in the recycle bin.