I wanted to add my products but i am confused. I have an embroidery site so when they order they specify the format of the file and the size of the design. I have one page set up for each design but i have files zipped for each format and labeled. Where do i add the button I have paypal buttons now with the settings so they choose their file and we send it to them. Do we just put the button on the file page. How would you know which file to send them.