I’m a bit in the dark as to how this might be resolved… 1) I developed QuickSave on the PC - I’m not Mac savvy at all. 2) Also, I haven’t actually tested the PC version on a network - I’m not really sure ZScript is meant to deal with network file operations and would have to defer to other ZScripters who might have some informed input here about that.
The error message is generated by a routine that follows each save operation using a simple “fileexists” test - displaying the warning you are seeing if it cannot confirm that the file was actually written on the path used for the save.
Sorry I couldn’t be more help. 