StoreHippo facilitates you to add additional fields, such as message box, option to select delivery date & time, upload file option, and so on. These fields can be added on the checkout page using the order options form. The order option form is a form that allows you to collect any extra information from the users at the time of placing the order. You can add various input fields, like text field, text area box, upload option, etc using the order options form.
You want to provide an option to upload a prescription on the order checkout page of your store.
Now, the upload prescription file will be displayed on the checkout page.