I have created a custom quick action for the activity in Account. All lightning experience.
The custom quick action is like a new task. I need to add a field to show which account this is coming from. So the field is called "related to", and it is supposed to be a lookup, related to the current account that this task is going to be created.
I am wondering how I can populate this field. I tried to search online and saw a few hints like a lookup field + process builder, or formula field. But still haven't been able to make it work.