Actually, we were talking about two different things. Sorry, I didn’t read your question precisely.
You wanted to import an template from the template store into your self-hosted SeaTable Server.
The document I gave you a link for is for setting up your own template store on your self-hosted SeaTable Server. Imagine you need the same kind of base over and over again. You’d want add a draft of this base to your own template store. Next time you need it, you click on “add base” > hit “create base from template” > select the template and, boom, there it is.