Consider allowing users to import templates

[kjellr]

In the Site Editor, there's currently an export option for Templates and template parts:

This will eventually be a full theme export, but for now, it just exports your templates. Today, it's unclear what users should do with the exported templates. They can't be imported independently, and they don't constitute a theme yet, so users can't activate them that way.

Even once this "theme export" workflow becomes more clear, it might be worthwhile to allow users to separately export and import templates and from one site to another. Let's use this issue to discuss this idea and its potential applications.

[kjellr]

One option for this would be to integrate templates/template parts into the standard export/import tool. They are included today when you do a full export, but they don't have their own specific radio button option. Should they?

[scruffian]

We should also allow users to import templates from other themes they have installed, or in the directory.