I am getting ready to start building a site ( probably going to go with a SmugMug Pro account ). I was curious, when you save your files, do you just save the largest file you are going to sell, and then downsize from that file if someone orders something smaller? Or do you have to upload the file in every individual size? I just want the pictures to blow up nicely full-screen but still be able to print a varying amount of sizes. Maybe this is a dumb question and I am overthinking it.