Plex on Kindle Fire Freetime cannot access SD Card
I have read a bunch of discussions on this that seem to have stopped last Fall. Presumably due to a solution that I cannot find. I have Plex on my son's Kindle Fire and put in an SD Card to sync movies with Plex. When I run Plex on the Fire directly I can set the external storage for sync but when inside Freetime I can only select internal storage which is so insufficient I cannot sync even one movie. I need to use Freetime for my younger son.
I tried moving Plex to external storage hoping that would allow it to sync to the storage it is on but it still only shows internal storage as a sync option.
Is there a solution to use Plex to sync to external storage on a Kindle Fire when running in Freetime?
I am a lifetime Plex Pass subscriber if that matters at all.