Hi, The other day I manually adjusted my FTP setting down though the website. I used the profile page, and then went FTP history to backdate it a few days to match with other records I keep.
Last night I went into the android app to do a workout, and realised a few minutes in that the workout was still based off my previous FTP. I was able to use the intensity slider to modify the workout to the correct intensity but it the app really should have picked up the new FTP on its own.