there are plenty of players that will play any file. even ios type mp4 files. so that's not a problem.
size is obviously a concern but that is not what he asked about
i have a 128gb sd card so i drop blueray rips on my phone all the time at 4-6 gb. but i got plenty of space to watch and delete as i go. i have numerous seasons of tv shows as well. plus kids movies to keep the children occupied when out and about. but to simply get the files onto the phone, only needs to connect it to the pc and copy and paste.