Make a field with a calculated value remain the same when a feature is updated

[Mapnado]

I have used an Arcade expression as a calculated field in Forms in Map Viewer. It’s working really well, but for my unique id field, I don’t want the value to change if the feature is updated. Is there a way to make a calculated value only calculate on insertion, rather than updates as well?

thank you!

[RhettZufelt]

See this post.  It should get you on the right track.

R_