Where can I find a larger version of the image I am trying to upload?
For the best quality glass print, we recommend that you upload the original photo file. Some common folders in which these original photos can be found in are the My Pictures, Downloads, or Desktop folders. If the images aren't already on your computer, try having the original photo file sent to you through email, Dropbox, or Google Drive from the photographer (make sure it's sent at the highest quality possible).
Original image files can also be uploaded directly from the camera or smartphone with which they were taken. Here's a step by step tutorial on how to go about mobile uploading with an Apple device, or with an Android device.
In some cases, there may not be a larger image available to you. If all you have is a file that's too small, please note that there's no good way to make a small file larger.