Requesting help for a script: Copy a selection across a track and keep the audio in sync.

You're on the right track. Instead of trying to drag the clip from one track to another just copy the selection, select the destination track and then paste.

You're video link doesn't work for me so I went by the workflow you posted:

// Get Track Names
const origSelectedTracks = sf.ui.proTools.selectedTrackNames;

// Separate clip
sf.ui.proTools.menuClick({
    menuPath: ["Edit", "Separate Clip", "At Selection"],
});

// Suspend Groups
sf.ui.proTools.mainWindow.buttons.whoseTitle.is("Group List pop-up").first.popupMenuSelect({
    menuPath: ["Suspend All Groups"],
});

// Slip Mode
sf.ui.proTools.editModeSet({
    mode: "Slip",
});

// Select Second track
sf.ui.proTools.trackSelectByName({
    names: [origSelectedTracks[1]]
});

// Brief pause
sf.wait({intervalMs:50});

//Copy Selection
sf.ui.proTools.menuClick({
    menuPath: ["Edit", "Copy"],
});
// Select First Track
sf.ui.proTools.trackSelectByName({
    names:[origSelectedTracks[0]]
});
// Brief pause
sf.wait({intervalMs:50})

// Paste onto first track
sf.ui.proTools.menuClick({
    menuPath: ["Edit", "Paste"]
});
// Turn on Groups
sf.ui.proTools.mainWindow.buttons.whoseTitle.is("Group List pop-up").first.popupMenuSelect({
    menuPath: ["Suspend All Groups"],
});
// Shuffle Mode
sf.ui.proTools.editModeSet({
    mode: "Shuffle",
});

Works perfect. Thank you very much Chris. That helped a lot.
I will study your script to improve my skills with soundflow.

The script is running into a issue on a mac mini M1 with pro tools 2021/12. I don't know if this constellation is the reason but on intel imac with pro tools 2021/7 everything works finde.
Error Code is:

Expected String but got Undefined (Outlander line20)

I aprreciate your help.

Your tip was great. It solved the problem. Thank you for your fast support.