I have a form "Lesson Items" with the dropdown field "To_Do".

I have a second form called "Plans" that has a lookup field to "Lesson Items", and (also) a dropdown field called "tasks". I already have it set up to pull in the values of the lookup items "To_Do" field and populate the "Tasks" field. That works fine.

But what I want to do is make it so that when I update a "Lesson Items" form, it will update any "Plans" forms that have the same ID in the "Lessons Items" lookup field.

I have tried:

From <on success> in "Lesson Items":

Plansfetch = Plans[Lesson_Item == input.ID] ;

Plansfetch.Tasks = input.To_Do;

And nothing happens.

How can I do what I'm looking to do?

Thanks