Cant fix the delay even trying enormeus values

Hello!

Im trying to remux a film adding a second audio track.
In audacity, i see that difference between oiginal track and 2nd track is 54 ms (second track is early than original track), so i added a delay of ms.

After remuxing, on audacity appear the same 54ms…
I tried with other values like 250ms for getting more delay but the remux is the same of 54ms.

What im doing bad? if not possible to add a track with specific delay?

Regards