Regarding the big black button, do you mean after dragging a file, and clicking the button, the file doesn't upload?

Thanks for the feedback so far - I rushed the contact page (also need to clean up the HTML + reduce http requests). Regarding the TOS - I have the same issue here, but there's also a non visible scrollbar on the right that you can pull down (standard Safari) - I'll make a custom scroll bar to fix this however.

Now, to come to the big black button. Did you drag & drop a file first? And it doesn't go to the upload progress after clicking it? Or do you mean design wise? :)

I go to the website. See a big black call to action button, so I click it. Maybe without reading the text first. Nothing happens. I get that if I drag and drop files then click it does stuff, but it needs to do something, anything, whenever it's clicked.

Also, the upload progress screen flashing by is alarming for very small files. Either wait a second before showing it, and so skip it for small files, or keep it on screen for at least a second even if it's done.

Will add to ToDo list, I could even look at the file size before going to the upload progress part (Unless user is using Internet Explorer). If smaller than x kb/mb => show an alternative uploading message

Good point, I'll add an alert of some kind when no files have been added & a user clicks on the button.