Copying chord symbols

I need to be able to copy the chord symbols from a long passage; when I try to do this, only one chord symbol is copied. I would attach the file if I could, but when I try to do this I get an error message: “Invalid file extension: Lost in Lover’s Lane.dorico”. Strange, no?

Use the System Track to make the selection before you copy, or draw a marquee selection.

There is an Edit > Filter > Chord symbols which might be useful after making a selection.