Before a template can be used, it will need to be assigned to stores. We can do this via the Templates page in Template Studio. 

To assign a template, select the template by ticking the checkbox to the left of the template, and then click the Assign to stores option.

Note: You can select multiple templates to do a bulk update.

This will open the Template Assignments window which will show the store tree. Tick the stores you want to make the template available at and then click Update assigned stores. Conversely, if a template is already assigned and you want to unassign it, you can deselect it from the stores.

Alternatively, you can access the Template Assignments window also via the options button to the right of the template. Note that this option is specifically for changing the assignment of the individual template.

As a quick guide to whether a template is correctly assigned to the stores you need it at, refer to the Assigned To column to see how many stores the template is currently assigned to.