Once you have selected a product, you can customize it as desired. At the bottom of the selection menu, there is a field where you can add comments. As an additional option, you can indicate whether you would like the product to be delivered unprinted.
Below this, you will find two buttons: the right button links to the template (working file), and the left (blue) button allows you to upload your files.
It is also possible to send your files by email hello@proflags.com or via an online platform such as WeTransfer or Dropbox. Please make sure to include your order number when doing so.