Relink multiple layers

@Todd_Morgan - Thanks feedback is appreciated!

@Stephen Marsh will give it a try and let you know thanks

@Todd_Morgan 

Try this script, it will relink multiple selected linked and embedded SO layers to linked (further code would need to be added to only replace linked SO layers):

/*
Relink Multiple Selected Smart Object Layers.jsx
v1.0, 14th October 2022, Stephen Marsh
https://community.adobe.com/t5/photoshop-ecosystem-ideas/relink-multiple-layers/idi-p/14155577
*/

#target photoshop

function main() {

    // Capture the initial layer visibility and layer selection
    var currentLayersState = getLayersVisiblity();

    // Replacement file selection
    var selectFile = File.openDialog("Please select the replacement linked smart object file:");

    ///// Process selected layers - from jazz-y /////
    var s2t = stringIDToTypeID;
    (r = new ActionReference()).putProperty(s2t('property'), p = s2t('targetLayersIDs'));
    r.putEnumerated(s2t('document'), s2t('ordinal'), s2t('targetEnum'));
    var lrs = executeActionGet(r).getList(p),
        sel = new ActionReference();

    // Loop over the selected layers
    for (var i = 0; i < lrs.count; i++) {
        sel.putIdentifier(s2t('layer'), p = lrs.getReference(i).getIdentifier(s2t('layerID')));
        (r = new ActionReference()).putIdentifier(s2t('layer'), p);
        (d = new ActionDescriptor()).putReference(s2t("target"), r);
        executeAction(s2t('select'), d, DialogModes.NO);

        // Replace the smart object
        if (activeDocument.activeLayer.kind === LayerKind.SMARTOBJECT) {
            function s2t(s) {
                return app.stringIDToTypeID(s);
            }
            var descriptor = new ActionDescriptor();
            descriptor.putPath(s2t("null"), new File(selectFile));
            executeAction(s2t("placedLayerRelinkToFile"), descriptor, DialogModes.NO);
        }
    }

    // Restore the initial layer visibility and selection
    setLayersVisiblity(currentLayersState);
}

app.activeDocument.suspendHistory("Relink Multiple Selected Smart Object Layers", "main()");



//// Functions - from jazz-y ////

function getLayersVisiblity() {
    var s2t = stringIDToTypeID,
        t2s = typeIDToStringID;
    (r = new ActionReference()).putProperty(s2t('property'), p = s2t('targetLayersIDs'));
    r.putEnumerated(s2t('document'), s2t('ordinal'), s2t('targetEnum'));
    var targetLayers = executeActionGet(r).getList(p),
        seletion = [],
        visiblity = {};
    for (var i = 0; i < targetLayers.count; i++) seletion.push(targetLayers.getReference(i).getIdentifier());
    (r = new ActionReference()).putProperty(s2t('property'), p = s2t('numberOfLayers'));
    r.putEnumerated(s2t('document'), s2t('ordinal'), s2t('targetEnum'));
    var len = executeActionGet(r).getInteger(p);
    for (var i = 1; i <= len; i++) {
        (r = new ActionReference()).putProperty(s2t('property'), p = s2t('layerSection'));
        r.putIndex(s2t('layer'), i);
        if (t2s(executeActionGet(r).getEnumerationValue(p)) == 'layerSectionEnd') continue;
        (r = new ActionReference()).putProperty(s2t('property'), p = s2t('layerID'));
        r.putIndex(s2t('layer'), i);
        var id = executeActionGet(r).getInteger(p);
        (r = new ActionReference()).putProperty(s2t('property'), p = s2t('visible'));
        r.putIndex(s2t('layer'), i);
        var visible = executeActionGet(r).getBoolean(p);
        visiblity[id] = visible;
    }
    return {
        selection: seletion,
        visiblity: visiblity
    };
}

function setLayersVisiblity(layersStateObject) {
    var s2t = stringIDToTypeID;
    for (var a in layersStateObject.visiblity) {
        makeVisible = layersStateObject.visiblity[a] ? "show" : "hide";
        (r = new ActionReference()).putIdentifier(s2t('layer'), a);
        (d = new ActionDescriptor()).putReference(s2t('target'), r);
        executeAction(s2t(makeVisible), d, DialogModes.NO);
    }
    if (layersStateObject.selection.length) {
        var r = new ActionReference();
        for (var i = 0; i < layersStateObject.selection.length; i++)
            r.putIdentifier(s2t("layer"), layersStateObject.selection[i]);
        (d = new ActionDescriptor()).putReference(s2t("target"), r);
        d.putBoolean(s2t("makeVisible"), false);
        executeAction(s2t("select"), d, DialogModes.NO);
    } else {
        (r = new ActionReference()).putEnumerated(s2t("layer"), s2t('ordinal'), s2t('targetEnum'));
        (d = new ActionDescriptor()).putReference(s2t('target'), r);
        executeAction(s2t('selectNoLayers'), d, DialogModes.NO);
    }
}

https://prepression.blogspot.com/2017/11/downloading-and-installing-adobe-scripts.html

@Todd_Morgan 

Multiple linked smart object layers selected and update all of them to a new linked source, whether or not they all share the same original linked source? I have added my vote. Until such a thing exists, I'll put up a script to do so.