Product Page with an Exisiting form

Question:
My WIX shop offers a few custom products (tshirts) that some require additional photos and data from the buyer when placing an order (e.g., a custom design with the pet’s name and photo).

Product:
Currently, my setup includes a standalone form where customers can enter details and upload a picture, but this form is completely separate from the specific product page. This allows clients to check out without submitting any pictures on the external form.

What are you trying to achieve:
I’m looking for a better alternative, perhaps a custom page that will display the product with all its variables and include an existing form with it’s upload option below. The end result should ideally be a single page without the option to place an order without uploading a picture.

What have you already tried:
i tried Adding Upload button to my “Product Page” which was irrelevant because i have products that won’t need any extra files.

Additional information:
Can you recommend the best solution that might be helpful.
Can i use maybe Google Drive instead?
If you think there are a few different methods to integrate a solution, please mention all the options and what you think will be the best solution

thanks in advance!

This will help you - https://www.wix.com/velo/example/print-on-demand