I have Gimp 2.10.24 on Ubuntu 21.04
I have set Gimp as the external editor in RawTherapee 5.8 (RT)
When I click the External Edit button in RT, Gimp launches but an error appears “Opening ‘/tmp/DSC06216.tif’ failed: Error opening file /tmp/DSC06216.tif: No such file or directory”
I checked /tmp dir & tif files ARE generated & user has permission to read/write those files.
I tried setting Gimp prefs for Raw import as Placeholder & RawTherapee, but the result is the same.
I also installed darktable, but no option for import shows up for that in Gimp.