You can use special web services to download and upload videos to YouTube. They help you to save your time and nerves. I had a similar problem: I couldn’t find how to upload videos to YouTube in MP4 format. I tried out different methods like certain apps, web services, or add-ins. However, none of them didn’t suit me. I was about to fall into despair until I came across this media hosting https://loader.to . It provides the opportunity to download and upload videos from/to YouTube or any place on the internet in different formats; it’s much easier to use an online service than any app or extension in your browser because, as for me, it doesn’t take any place on your RAM and hard drive