Cannot save file in workout creator on PC. Also cannot find previous saved files?

So I have recently gone back to using my PC from Apple TV. I wanted to try and create a workout file on Zwift PC but when I come to save the file before using it I get this message:
Failed to save file
C:\User\Wayne\Documents\Zwift\Workouts/8641/workout1.zwo
Is it because of the path name?

I also cannot find any of my old workout files eitherGrrrrrrr

Many thanks
Wayne