Importing photos to Ipad Pro

If you're trying to sync the photos on using iTunes, it only syncs one folder at a time. So to add photos you'd need to add the photos to the existing folder that you sync and do your sync.

Or if you want to bypass the whole syncing issue you can e-mail them to yourself and save them from the mail (wont' be a great idea if you have a lot I know)

Or you can upload them to something like Dropbox or flicker and download them from there