how to add names in end of file name

This question refers to basic functionality of Mp3tag.

  1. Read FAQ area ...
    How do I append the string " xyz" to the content of a tag-field?
    Actions

  2. Read Mp3tag help manual ...
    Characters with special functionality
    https://docs.mp3tag.de/scripting

The applicable format string should look something like this ...

%TAGFIELD%' [appended text enclosed in square brackets]'

DD.20121228.0852.CET