I don’t believe we ever claimed this was user error, but I’m happy to tip my helmet to @Nicolas_Chauvel for sharing a workaround with the community!
Heads up, though: The issue seems to be with the direction of the slashes when creating the folder. “…AppData\Local\Zwift\events\upload\workouts” is fine, but “…AppData\Local/Zwift/events/upload/workouts” seems to confuse some PCs.
I and many other I know have had this issue for a long long time, I have personally had the problem for 4 years. Others have had it as far back as 2017. I only just found the solution because a twitch streamer for zwift was dealing with it as well. This may be something you guys may want to address on a larger scale to make sure your user base is able to have functional event workouts without requiring a forum search and manual folder creation to resolve the issue.