How big is the video you are trying to upload? There may be a file upload size restriction set on uploads for your server. Check with your server administrator if there is any upload restrictions set that would prevent videos from being uploaded.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.