I want to show this thank you

When I add videos to the product, it prompts me to upgrade the template. In the link, it asks me to find the "product template" file, but there is no such file in the template, so I can't continue to...

I want to ask how to set the carousel graph on the PC and mobile terminals separately, because the height of the carousel graph on the mobile terminal is too low. If you modify the height in the code...

In the product page, the product description is expanded by default, but the product reviews is closed. How can the product description and the commodity reviews be opened by default?