@Andy_Shuttleworth
It sounds like you’re familiar with this support article, then. The only way to upload it to Zwift’s servers is to have it properly upload when you save & exit.
What might be useful is to locate your log file from this session and upload it zwiftalizer.com. This is a third party site that’ll parse that log and analyze issues that may have interfered with a clean upload & save. This is where to locate your logs. Would you try that, please?
I tried that and also sent the lates one (at the top of the list) to Zwift. I couldn’t see anything muchg there except it said my version of Zwift was an old one (ending 05) rather than the version ending 29. That is odd as the Mac App updated a couple of days ago.