Understand I think and thanks for further feedback.
Don't need field action - ok.
Move to visible tab - already had, changed to field type, activity ID does not populate it, unfortunately.
Suppose the whole thing falls down with no actiivty ID, being shown.
With it, I can try to condition against it in User Update Action using: = 0 or = 'blank' or it might not need to be conditioned, is what I picked up from:
"need to check that it's equal to 0, equal to (leave empty), or probably the is empty condition".
If you think it's worth it community-wide be great to pin this down. Otherwise can unpublish. I'm at tail end of my project would gladly move on, but again think it's an awesome addition to this auto action.
Joomla 3.6.2
CB 2.0.15 Latest Nightly
GJ 3.0.1 nightly
Php version 5.5.35
Auto actions nightly
Activity nightly
Privacy nightly
Conditions nightly
CB Gallery 2.0
.....all nightly!
Uddeim 3.9