So I have seen some further development on this issue. I have found that if you wait and I’m not sure how long yet, the videos eventually upload. I don’t know what the reason behind this is, however I suspect it has something to do with some kind of video processing Apple are doing once the video has been captured. They could be putting a lock on the file while they re-encode a HEVC version.
Even if that was the case (and it’s just a personal theory at the moment) it doesn’t explain why you still get the issue if HEVC is disabled with a lower resolution and frame rate, nor why you can manually upload the video immediately but have to wait for it to occure naturally.
I have had an initial response from support, hopefully that progresses to a conclusion and I will update here.
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