Hi Novanut,
Both of your devices should be compatible with AirDrop. Have you considered this option? It’s what I would do in your shoes.
Make sure airdrop is enabled in the iPad, set to receiving from everyone, and Do Not Distrurb is turned off. On the Mac, open Finder, then select Airdrop, then drag the photos into Finder window where you should see the option to send them to your iPad. See more info here: https://support.apple.com/en-us/HT203106
One more thing to consider, Airdrop often doesn’t like sending lots of large files at once, so you may have to send the files a few at a time depending on their size. Other than that, this should work well.
Either of the other options mentioned above should work well too.