BIAB has a really useful feature that stretch the audio files to fit the new tempo when making tempo changes, but I can not make it work properly. Not sure if it is a bug or if it is me doing it wrong.

I created a song at tempo 91 and recorded a vocal performance and imported it on the audio file track. When I change the tempo to 84 it sound perfect. BIAB has automatically stretched the audio to fit the new tempo. When I save the file and close the app and open it again later, the audio file however play back at the original tempo and does not fit the BIAB song anymore. It also happens when I export the audio to audio files. The rendered track export the audio file at the original tempo while the other tracks are all at the new tempo.