We just returned from the Enchanted and they've recently locked out connections to the HDMI input. ☹️ Earlier last year it was an option but no longer. My Roku device would no longer even connect- it wasn't even on option BUT their USB input is still available to switch to. I had a HD formatted for NTFS which worked and another HD formatted with exFAT which didn't work. when I arrived home I reformatted it for our next cruise. I suppose a thumb drive would also work with the correct formatting. I didn't try. Once the HD was in place, it stayed there tucked in behind the TV only having to switch the input as needed.
Their remote, once switched over with the toggle switch, worked OK for navigation & volume.
Using an external HD gives the advantage of not needing an external power supply as theirs is difficult to get to and our AC outlet was across the room on the desk and leaving an extension cord laying on the floor wasn't a great idea anyway.