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

[longsonN]

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.