@johnkeel just review this thread as I encountered the same Problem setting up DMD with an external SD card on my Samsung Active 2 tab. I did reformat the SD several times. It does appear in setting not being part of any internal storage. Nevertheless I don’t even see/find an option to store any map on an external storage. Also did also look for the option to enable external storage in general setting but it’s not even there. Attached two screens that show what I do encounter. Please help 🙂