Use Row IDs
We recommend using the Row ID column instead of the Unique ID special value. Learn more here.
The Unique Identifier is a special value that you can assign to a row when users add, edit, or submit forms. This unique identifier gives you additional control over relations between items in your app.
Configuring Unique Identifier Values
The Unique Identifier can only be added to screens where users can add, edit, or submit new entries. You can start by adding the Unique Identifier component. After this, choose the column where the unique values will be stored.