Can I transfer mp4 files from an external HD to an IPad without using Itunes?

I have 500gb of movies on an external
HD I want to transfer to my IPad.
If I use ITunes, the memory on my Mac gets filled since it's only 250gb.

Read more: https://ipadget.com/talk/itunes/can-i-transfer-mp4-files-from-an-external-hd-to-an-ipad.html