Do they actually mean scan the stamp on a scanner > save to USB and post that here?
Save to USB? No idea what that is.
One should have a Folder where everything goes first.
Downloads, scans, notepad, ad nauseum.
you can then move items, to their desired locations at will.
In that folder you can re-name, edit, crop, copy and all sorts of things.
Folder named like "Dgparent stamps"
then all your scans, smart phone images, downloads, can be sent to that one familiar location.
Being organised is a valuable discipline to conquer in stamp collecting.