If statement pulldata/appearance logic

Question

I am having trouble with an if statement logic.  I am not sure this is possible.  If an email is present, fill in the email using a pulldata calculation.  If there is no email, users need to search for an email from a different source layer.

if(string-length(${email})<1,'perform a pulldata calculation','perform a search appearance from a different layer'))

We are using the app and not the browser version.

ChristinaMcCullough1 · Accepted Answer

This worked.  Thank you.  I added a search appearance calculation to the survey. The result displays in the drop down.  A user will have to accept the new value.  Is there is a way to populate the field without clicking on a selection?