Hello,
I’m facing similar issues here. When I import a Rhino model, I got the same message “You do not have sufficient permission to save the following content to disk. (…)”
This occured after updating to Unreal studio 4.20 this morning, while the error did not occur last week using the previous release. It only happend for a large model (125 MB, 12k objects), not for a small model (18 MB). I guess it also has to do with the 256 character limit.
" /Game/Import/[xx]/Geometries/5ca3267c-a010-4a93-b601-671c3ce1f9f515586e07-eb02-4834-80eb-eff8fd6e48fca2d7d44f-1e1a-4526-ab1a-8f818f4af9bcd89aabfd-9731-4d49-91f1-81272e89dc9b1bb211a2-2533-4223-8ff4-34696287453854207a32-9b5f-44ba-9bda-29b3f45ea3da_m "