This function executes the upload of the customer's image into the preview.
It is used exclusively with the upload image option.
To add an upload image function
1. Go to the option you want to work with
2. Make sure it is an image upload option
3. The Upload image function will be applied by default to this option since it's the only function that works with this option.
4. Enter the Personalizable Element ID to connect the upload image function with a specific image placeholder element from the preview. This is the Unique ID of the image placeholder that was created on your template.
