Video won't download (crashes at 62%)

I can't download the video I created. I've tried on multiple devices, and tried clearing the cache, as was suggested. Each time it gets to 62% then says the download failed, without any explanation for what the error is specifically. It takes hours just to get to 62%, so these attempts have been over the past 2 days. I spent weeks editing the video and am really frustrated that I can't get the final product.