I’m sorry to bother you. I use 3 differents ubuntu studio installation, I confuse the 3. 2 are without gvfs, the one that i use with RPD, is installed with gvfs. I have no time (& money, since 2 years, it’s a hard time for a commercial photographer!) to wait & to devote to an implementation of gvfs. It already exist in Darktable which I use & it does the same thing that i need. The backup will be done by the NAS.