Creating templates for SharePoint Libraries has required quite a bit of “fiddling around” in the past. As a result of updates in 2020, adding templates has become very easy.
Here is the process.
1. Create the Template in Word/PowerPoint/Excel.
This is your normal process of creating templates. It should be noted it does not have to be a “template” file (ie dotx).
2. Open the Document Library and select “+ New” .
3. Then select Add template.
You may also note you can edit the menu here.