How can I add an image upload button for customer designs?

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I am not certain this is the correct label. If it isn't I apologize. The last time this subject was addressed looks like Oct. 2022. I would like to know how to add an upload image button when customers are designing their t-shirts, etc. in my shop. Is there anyway to do this now? Can I add it in a third party app or just to a page? I don't know coding but might be able to do it if I am given a detailed answer.