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We don't currently have a tool that allows people to upload their own videos and play it on a SynthaSite website. Another source such as YouTube or Google Video would need to be used and then the video added to your page from there.
If you want to be able to play other people's videos on your site you could have people submit their YouTube video url to you and then you could add their video that way. I know this isn't the perfection solution, but I hope you will be able to use it.
Meebo has a really great form builder which has the option to attach a file, but it isn't free. Here is a link to Web Form Buddy which has the feature, it also isn't free but does have a free trial version: Web Form Buddy. I have not tried this so am not sure how good it is. Let us know if you try it and how it works for you.