It depends on responsibilities imposed on us by our PM, TL and but our preference will be to support the team , going to perform UAT on the Application or Built
As the UAT testing is going on the Tester has to test the application according to the Project guidelines along with BRS and SLA Documents which contains actual business logic and the actual test data provided by the USER.
As a test engineer we should test the application as per requirement, but while doing UAT, our main focus is on End to End or system testing, instead of FT and IT Most importantly it depends on the work allocated by the PM to a QA