Uploading Limits

Are there rules/limits that apply to uploading videos when using stream? I just joined and I have large amount of short videos to upload, most of them 30-50 seconds. So far I’ve figured out that I can only upload one of these at a time, and even then it doesn’t work sometimes and I have to refresh the page and try again. Is this normal? Any way I could pay a little extra upfront just so I could get my work uploaded or do I just need to have this process take weeks to get all of my content uploaded?