Why can't I add signals to my SignalTap File (.stp) from the Node Finder?

Description

You can add only signals that are found with the filters SignalTap II: Pre-Synthesis and the SignalTap II: Post-Fitting. You cannot add signals from any other filter in the Node Finder to an STP file.

For more information on using the SignalTap II logic analyzer, refer to the Design Debugging Using the SignalTap II Embedded Logic Analyzer chapter in volume 3 of the Quartus II Handbook.