What I did: Purchased premium today. Wanted to add a link to another note.
What happened: Clicking on the link icon did not do anything.
What I expected: Window would open to select note.
Things that might be helpful to know (Agenda version, OS and model, etc):
I closed Agenda on iPad, opened again and was able to create 1 link. When I tried a second link, it did not work. Closed Agenda, opened and was again able to create just 1 link!
It works on iPhone as expected.