I have an update on the podcast that was supposed to be ready last night/this morning. The original file from which the export was made has been corrupted. This must be why the export from the file didn't work and why youtube wouldn't accept it. Most of the work done on the podcast, to make it ready, has been irrevocably lost.
I'm sorry, there won't be a podcast this week. I will edit the file from the start, which will take many hours, and see what I can do to take steps so this doesn't happen again.
I'm somewhat disheartened; I will have the masterclass post ready for Wednesday, as originally planned.