I'm trying to add to the Genre tag. The field is empty and nothing I've tried works.
You simply set the genre text and then save the changes.
Where and how did you try to set the genre?
I tried to do a global replace using Replace and Replace with Regular Expression. It wants something in the field to replace.
To do that globally, use an action of the type "Format value" for GENRE.
SImply enter the new genre as
and run the action.
Alternatively, set the genre in the tag panel and press Ctrl-S
or Convert>Tag-Tag for Genre and a corresponding format string
That worked. Thank you
Just for the background info: if there is no data in a field, then the field does not exist. There is no such thing as a "table" in the file for which one has to fill the cells.
This means that you cannot replace something that is not there with something else.