My dad has a lot of photos on his windows surface laptop, and some others on a USB drive. They don't all fit on the laptop at the same time for space reasons.
The goal is easy: copy the photos from both sources to the iPad. I've never used Apple devices before, but it seems that the concept of a proper for system/explorer is not really a thing there.
Some of the things we tried were copying photos via iTunes. But that can't access the photos on the external drive. Same problem with Dropbox. And apparently you can't really just create a folder on the iPad and copy things there. Any pointers?