The Custom Medium feature does not currently come on any of the Art Storefronts plans. This may not be included in your current plan.
You may need to offer a medium type that is not something Art Storefronts provides by default (think of things like Round Canvas). Or, you have a more complex offering where you might need additional Medium Types, so you can show different style finishes or print options for each. In these cases, custom Medium Types will give you ultimate flexibility to do whatever you want. We even give you access to code your own custom 3D preview.
If you’d like to learn more about Custom Medium types or review the steps on setting them up, please read over How To: Create A Custom Medium Type And Use Default Code Snippets.
If you do not have the Custom Medium feature and you’d like to upgrade, please e-mail firstname.lastname@example.org.