I've been battling this one for longer than I would care to admit. Currently I'm trying to get the Global Actions (Log a Call, New Task, Send an Email, etc) to show up at the top of the lightning experience "Activity" component.
I've searched all over and found the answer of "Add it to the layout" (which I did) and "Assign the relevant record type" (which I can't, because tasks don't HAVE record types so the option isn't in the Global Action).
I'm looking for another possible cause of this problem. My org is a Developer edition scratch org, and I would very much appreciate any suggestions.
Edit: This is in relation to the Case object. I have it working fine in a standard dev org, but my scratch dev org doesn't seem to want to show those buttons.