This template is built using Notion, which offers a seamless experience across all devices, including desktop, web browser, and mobile. This means you can access and edit your backlog on any device you like.
At the moment, this is not possible. In order to do this I need to use not just todo items, but a table together with Roll up properties. And this is not so easy to do with the current version of Notion API.
If you are on a desktop device, just select the items you want and click on any of the checkboxes. If you are on mobile, you need to double click on any text on the page, select the items and do the same.
Feel free to reach out if you have any questions!
You can always contact me using the details below.