Audio track modification in multicam clip

Hi,
On a multicam clip, I have modified some audio samples with fairlight on one of the audio track because of scratch noise. But after flattening my multicam clip, audio track (same one) has no more modification.
How to keep multicam modification after flattening
Thank you for your help
Regards
DaVinci Studio 19.1.4
On a multicam clip, I have modified some audio samples with fairlight on one of the audio track because of scratch noise. But after flattening my multicam clip, audio track (same one) has no more modification.
How to keep multicam modification after flattening
Thank you for your help
Regards
DaVinci Studio 19.1.4