The automatic sorting will be done by looking at each pictures timestamp
The timestamp is saved in the pictures "exif" data
If a picture has been edited and saved it will have received a new timestamp and therefore it might not end up in the category you were expecting it to end up in
But there is an online free tool where you can:
- Upload picture
- Change the date of the exif data
- Save it
- and upload it again
You can find it here: https://www.thexifer.net