After backup my iPad (iOS 15 beta.8) through Finder (or iTunes on Windows), I could browse the backup folder using tools like 'iMazing'.
And I found there are remaining asset files in this folder 「AppDomainGroup-group.com.apple.mobileslideshow.PhotosFileProvider\File Provider Storage\photospicker」which are picked by PHPickerViewController.
I wondered why they were not cleaned by system and how long they will be kept?
Thanks for your reading and looking forward the answers!