We regligiouslly watch everything on Plex on all devices in our house but I'm travelling a lot now and often struggle with free wifi, etc.

I have an iPad Air 2 with the latest iOS - what is the best way of transferring movies (MP4, AVI, MKV) to the iPad to watch with the least hassle? If I can avoid converting, iTunes, Etc that would be ideal.

Any recommendations?