Once i open a file in Rb and set the tempo map, i tend to stay in Rb and not drag to another DAW since RB is the one that had the ability to make a tempo map out of a file that did not have one. Then add any tracks you want. and it should all run smoothly to the tempo mapped MP3 file.

HP Win 11 12 gig ram, Mac mini Sonoma with 16 gig of ram, BiaB 2025, Realband, Reaper 7, Harrison Mixbus 9 32c , Melodyne 5 editor, Presonus Audiobox 1818VSL, Presonus control app.