Errors such as "File Could Not Be Validated" etc.
< If your files will still not upload, and you are using a mobile device (phone/tablet), you may need to view the computer version of the Shop. You can do this in your browser settings by clicking "Desktop Site" or "Switch to Standard View" - this will display the shop as you would see it on a computer and you should no longer have issues with files uploading provided they meet the size/type as explained above.