Thanks. Yes, I have the powerpack and workflow installed.
One thing I noticed just now is that the snippets in the workflow didn't import with the keywords set. Once I added a keyword I was able to get the snippet to work, e.g. here => 2020-04-27. Are the keywords not supposed to be imported along with the workflow, or is there a problem somewhere?
That aside, what I'm really trying to do is use these snippet triggers within another snippet. OnceI realized this was probably the problem, I found your comment to a thread on nested snippets, which I read as saying I'll need to customize the workflow in order to get this to work. Is that still the case, as far as you know?