Transposed song is not changed
When transposing, the original song (-text) is not changed, only the chords are transposed and the transposed chords are displayed. However, a ‘transpose’ directive (e.g. {x_sccrd_tr:2}) is added to the song text. So if you look at song in the editor or the smartChord Online Editor, you will see the song in its original key but with the ‘transpose’ directive. If you open the song with smartChord, it will appear transposed. But there is a possibility to leave the song in transposed version and save it as it is visible. For a transposed song there is a menu item ‘Transpose -> Keep transposed’. It replaces the original text by the transposed text.