How to insert a plug-in to the next free slot (working across multiple types of tracks and Pro Tools versions)

Hi @MixedByRQ.

We've been working on an easier way to do this in the upcoming release of 3.5.
In other words, once 3.5 is updated, this will require less code.

Until we get 3.5 released, you can find some info here:
https://forum.soundflow.org/-744#post-22

And you can also take a look in this script for an approach:

sf.ui.proTools.appActivateMainWindow();

function getFirstFreeInsertIndex() {
    var btns = sf.ui.proTools.selectedTrack.invalidate().insertButtons;
    let insertArray = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
    for (let i = 0; i < insertArray.length; i++)
        if (btns[insertArray[i]].value.invalidate().value === "unassigned") return (insertArray[i]);

    throw 0;
}

function clickPopupMenu(popupMenu, paths) {
    for (var i = 0; i < paths.length; i++) {
        var path = paths[i];
        if (popupMenu.menuClickPopupMenu({
            menuPath: path,
            onError: 'Continue'
        }).success) {
            return;
        }
    }
    throw "None of the provided paths were present in this popup menu";
}

function addCLAEffects() {
    var popupMenu = sf.ui.proTools.selectedTrack.trackInsertOrSendOpenMenu({
        insertOrSend: 'Insert',
        pluginNumber: getFirstFreeInsertIndex() + 1,
    }).popupMenu;

    clickPopupMenu(popupMenu, [
        ['multichannel plug-in', 'Effect', 'CLA Effects (stereo)'],
        ['multichannel Native plug-in', 'Effect', 'CLA Effects (stereo)'],
    ]);
}

addCLAEffects();

Currently trying to crack the code on this as well. Did you ever get this working? Appreciate any help!