How can I transfer pictures from my PC to my iPad Pro

Here is an Apple document on the subject.

Transfer photos and videos from your iPhone, iPad, or

iPod touch

https://support.apple.com/en-us/HT201302

You can use itunes to transfer the files. That said, if your use iTunes to sync p hotos on you’ll need to use iTunes to sync them off.

You can also use things like Dropbox or other file transfer services to move them.

If you just have a few you can email them to yourself and save from the email.