Ren here from the Shopify support team, thanks for the great question.
It sounds like what you're looking for is a product customizer app. This will allow your customers to upload their own graphics or determine their own text for your Print on Demand products. We have a couple of different options available so be sure to check them out. Notably Customify and Zakeke Product Customizer. Our fill list of product customization apps can be found here.
If these aren't quite what you're looking for, then I suggest checking out our Shopify Expert marketplace to find a developer to assist in developing the app that's right for you. You can browse for an expert or list a job description and receive proposals from suitable experts. Check it out here.
Would love to know your thoughts on those options!
Ren | Social team @ Shopify
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