Yeah when I first started uploading I realized that the problem is partly that you can't use steemconnect to log in because after a few uploads it will stop you from uploading and 2 you will eventually have problems uploading with firefox. There are a few ways to fix this. 1 have multiple browsers to upload like firefox, google chrome, opera, internet explorer. I will sometimes try each one out and 2 sometimes if you delete your cookies it will allow you to watch videos and upload better.