Hi Murad,
I don’t have any help with user cropping (although I would like to know).
What also might work for you is the features that Adalo’s image cdn has.
See: How to manipulate images in Adalo with ImgIX
I use this for almost all images now. For profile pics the face detection works very well. For example:
$URL&auto=compress&fit=crop&w=30&h=30&dpr=2&crop=faces