Both the Home page and Product Page widgets can be accessed through the Online store → Customize.
You would need the Online store → Customize in these cases:
In any theme, you need to add the Customer Photo Uploader section to the Home page to activate the Home Page widget.
In an Online Store 2.0 theme, you need to add the Customer Photo Uploader section to the Product page → Default product (or any other template) to enable the Product page widget.
When you want to change the widget position or attach it to a particular product.
To make changes in Customize:
Go to the Online store and find the Customize button near the current theme.
Select the Home page /Product page from the upper dropdown. For the Product page, select the appropriate product template.
In the Apps section in the left sidebar, find and select the Customer Photo Uploader app.
To change the widget position, use drag & drop within the left sidebar.