Same does exists with the Solo 8k.
Workaround:
there is a stable (independent from hot swapping of the HDD) folder: main Dune_somethingsomething.
Inside there are 3 folders:
builtin_memory
builtin_memory_dunehd
somethingsomething(for hdd).
I am just using the 1st one as the "anchor", and then I need to individually select the specific subfolder of the hdd.
PS: Yes, I do know how old this post it. But it seem that despite the 120+ days passed, the manufacturer is unable to resolve the issue (and IMHO they will not be able to: hot swapping in my Android phone results with errors in reading my SD card because... each time I am hot swapping it - Android assigns the random string after the "sdcard", e.g. I have now sdcardAH79FHACC, but if I'll hot swap it it will become sdcardFFa21something something, and while during the reboot the phone would sort it out, hot swapping messes with it. Somehow I do believe that it is a reason of keeping the Collections data in the internal memory).