Adding images on IOS app?

Missing a few images here, particularly under Artists, and there would like to add images either from the web or local storage in my Photos on Ipad.

No clue how to do this!
Tried to figure it out, when I edit I get the option to “Drag images here.”
How would that work on ipad?

Thanks much.

I don’t think this action is supported on the current version, at least I can’t work out how to do it either.