FireTV storage problems…

Hi all – been dealing with this issue for over a month now and have tried just about everything I’ve come across here and elsewhere. Wondering if there’s some critical step I’m missing.

I started getting the low storage message, so I tried moving the thumbnails to a USB (as described here: http://www.aftvnews.com/how-to-partially…b-storage/)

I continued to get low storage, so I tried a tool that would clean up packages and cache, but errored on trying to clean up thumbnails, I assume that’s because I had moved them to the USB.

I continued to get low storage messages, so now I’ve tried moving all Kodi data to USB (as described here: http://www.aftvnews.com/how-to-partially…b-storage/)

Still getting the low storage messages. Is there some manual deletion process I need to go through? I used the delete command at the end of both the thumbnail move and the all data move…

Thanks for any insight.

-T