Rupa Ax not recognizing HD

I’ve just got a Rupa to replace using Plex on my Roku.

I have a 5tb HD that I’ve been using for awhile now for all my movies and TV. It was hooked up the a PC that was running plex that I would use over my Roku box.

I just got a Rupa A5x with Kodi installed and it won’t recognize my HD. When ever I attach the drive I get the option to mount it as internal storage but then it wants me to format it and loose all my data. I heard an off handed remark on a youtube video that these boxes couldn’t handle a 5tb drive but I couldn’t find that info anywhere else so I don’t know if that is true. The HD is formatted NTFS. I have tried a Thumb drive that is formatted as Fat32. That wasn’t recognized either.

I tried a program called Paragon to mount the drive and it did nothing.

Any suggestions?
Thank you