Problem transferring video files to iPad from Mac

Hi,

I just bought an iPad 4 for my 4 year-old granddaughter and am trying to transfer video (mp4) files of kid's shows from my iMac (Mojave) to the iPad. I'm using EaseUS MobiMover, and the program says the files have been moved.

The problem is that I can't find them on the iPad. Is there a special place video or movie files reside? How would they be viewed on the iPad? iMovie? Can I create a folder on the iPad where I can keep them once I find them?

Many thanks from this complete novice to iPads.