For PC/Mac
Zwift workout files are saved under Documents/Zwift/Workouts/YourZwiftID as “.zwo” files.
If you have downloaded a new workout file and want to use it in Zwift, simply save it to Documents/Zwift/Workouts/YourZwiftID (where “YourZwiftID” is your Zwift ID number), then start up Zwift. Your workout will appear under the “Custom Workouts” category in the workouts list.
To further organize your custom workouts you can create directories under Documents/Zwift/Workouts/YourZwiftID and save your workouts to specific directories.
For iOS
See How to copy workout files to Zwift for iOS.
How to copy workout files to Zwift for Android ?
I have placed my Custom workouts from PerfPRO under my documents and Zwift ID , but they don’t show up in my Zwift custom workouts. Any suggestions?
Try to create bike workout in zwift and then start copy workout you need. It works for me when I did that but when I create from blank file Zwift didn’t see it (probably typo, other mistakes possible i don’t know).