Permission Denied error saving in Draw.io on Linux

 I installed the desktop version of Draw.io on my Ubuntu system using the Ubuntu Store (snap).  When trying to save files to my Windows partition (or mounted device other than / (root), a received the following error:

Error opening directory: Permission denied.

After some digging, I found that the permission for the snap defaulted external devices as disallowed.

Permission disabled
Had to simply enable "Read/write files on removable storage devices", and viola!

Hope this helps other seeing the same behave from this or other snaps.

Cheers!



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