I'm trying to write an arcade expression that will grab the last value used in a field and populate that same field on creation of a new record. Also to have the rule only "fire" if the new record and its target field is saved on creation as null.
Basically a "translation" of the Attribute Assistant Method Last_Value into Attribute Rules. I'm assuming there will be some use of loops, but honestly I just need some nudging in the right direction and help on how to construct this expression.