I could upload photos but not a video. The previous solution (versions/settings) didn’t help, but I found that I needed free space greater than the size of the video to upload. Not sure how much space was required. Got various unhelpful error messages (video may have been deleted, network error). Having created enough free space the app went through a stage ‘preparing to upload’ with a progress bar, which I imagine was getting an error that it wasn’t catching / reporting.