No thumbnails on my dvd's

I’ve thumbnails shown on my PCs when transferred my dvd’s across to my iCloud. But these are not shown on either of my iOS or android tablets. Is there an easy fix for this?

How are you creating thumbnails for DVDs?

Via I tunes. Creat artwork after saving poster from The movie data base on line. Then transfer the ripped dvd to iTunes to add artwork. After which transfer to DVDs folder on wd my cloud. I have been using sea gate personal cloud. My thumbnails transferred over ok. I’ve used all the storage on that so have upgraded to wd my cloud mirror. Although it all works fine, I can’t transfer with thumbnails. Any ideas?