Suggest downloading video file and uploading separately to various platforms. ie don’t upload to YouTube and use that link in Facebook posts (video won’t auto play on Facebook like that). By uploading separately to each platform they’ll handle it, and display it, in the best possible way. For instagram upload to IGTV (instagram tv) - their video service. In the upload pane there’ll be an option to ‘show preview in instagram feed’ which will play the first 1 minute and offer viewers to ‘watch more on itv?’. If a site, like the donation site, accepts video it’ll likely be via a YouTube link - that’s fine. It’s just Facebook that doesn’t play nicely with YouTube links. By now you’re thinking, ‘geez, swimming in freezing water is easier!’.