Good work for 3-weeks in @IssacBows, thank you ! 

Yup, we all experience the "red blinking-light syndrome" when switching camera to record, our off-cam, and practise takes are usually better !!!

Oh, and yes as @ELCBK mentioned - it played as audio only here (which could have been your intention, possibly?)

Anyway - that's a great start to what will be an awesome journey !

@IssacBows - Emily suggested I think about the missing video from your post.

I still couldn't play it (well, I had audio, no video) - but - then I downloaded it. Once downloaded, I discovered this (it's not going to answer the problem though) - 

If I play the .mov file using VLC Player - I get a single, still image (well, it very occasionally jumps forward a bit - but the audio is all there.)   I tried to play it in Windows Media Player - and I just got the blank screen, but again with audio present.

This is what the VLC Player showed - but as I say, just stayed like that, then eventually, a little jump forward (adio fine all the way through - so it's not as if the player was skipping)

I'll add something else (but it is NOT the problem!) - uploading directly to the form, especially video, eats up a lot of server space - it's more usual to provide a link to it, say on You Tube, or a GoogleDrive/docs, DropBox etc etc....   I understand some folks don't want to necessarily share stuff as fully public - and you can, for instance set the sharing to "unlisted" on You Tube - (and of course on other sharing platforms) then only those who are given the link (or see it in the forum) will find it.  But - that's purely an aside - it's not the problem.

I really suspect "something has happened" during the processing or finalising of the video - and that's what you've ended up with.  Inspecting the "properties" of the downloaded .mov file "suggests" there is video present....

Not a lot of help, I know.... 

Perhaps try just a very, very short vid for "test purposes" - doesn't have to be a "performance" take - say a major scale or arpeggio and post here, just to try to home in on the issue?  Just a thought....

Cheers !