Hi - forgive me for jumping in on this thread but it's the closest to what I am trying to do

Basically I delivered a 4-camera live concert stream on my ATM Mini ISO ... I had to use 4 different cameras, each with different length HDMI cable from their positions and one was on a Hollyland 300 wireless link.
The stream went out fine - the bands would like a copy of their set so I've opened the Resolve file and have the set.
However because of each of the different camera models and connectivity, each angle has a different audio delay (either 3, 2, 8 or 38 frames).
What I want to do is open the ISO files and slip the video by the required amount and hope that when I then open the master timeline, the respective angles will now be in sync to the master audio/sound desk track.
Is this feasible ? ... I've tried opening, slipping and exporting one of the angles but it reports media not found despite renaming to the same as the original file?
Thanks for any assistance ...