How do I install my custom templates in Microsoft Word for Mac?

I use a MacBook Pro running Big Sur. I also use Microsoft 365. My copy of Word had my custom templates ready for use when I launch the app, but since I upgraded to Big Sur the templates no longer appear.

I had this same problem a couple of years ago. Someone in this community (I think) showed me how to install those templates, but I can't recall how to do it. The templates remain stored where they're supposed to be (I checked)—/Users/*****/Library/Group Containers/UBF8T346G9.Office/User Content.localized/Templates.localized.

Can someone please show me how to make Word recognize and display my custom templates. Thank you!

(Sidebar: This form insists that I select a "topic," but I honestly cannot find anything in the list that comes close to applying to this question. I had to choose something, so I settled on "Developer Forums.") I hope my question doesn't vanish in the fog.)