I imported a xml file with chords symbols, which are recognized and can be seen in the score in Dorico. When I transpose this score, the chords are not transposed. Why not?
The chord symbols need to be selected in order to be transposed. In the iPad version, the simplest way to transpose everything is to make sure you have nothing at all selected, then choose Transpose from the menu on the secondary toolbar. Dorico will then automatically select the entire flow, including key signatures and chord symbols, and everything will be transposed.