Is there any way that I can let a user upload images to my shopify store, and then use this images in my app (that is hosted on my own server), and then that the user can see a product that i made for him in my app, at the store?
for example, I want the user to upload images and then i am going to print them on a shirt (like printful) and then
he can see preview of the shirt before he buys it.
thanks a lot
You can install a third party app for that (recommended):
https://apps.shopify.com/customization-tool (these guys have a pretty good customer service)