Convert all alpha channels into layers.

// create layers for channels that are not empty;
// 2020, use it at your own risk;
if (app.documents.length > 0) {
var theChannels = collectChannels ();
// create layers;
for (var m = theChannels.length-1; m >= 0; m--) {
loadAndLayer (theChannels[m][1], theChannels[m][0], [0,0,0]);
};
};
////// collect layers //////
function collectChannels () {
// get number of layers;
var ref = new ActionReference();
//ref.putProperty(stringIDToTypeID('property'), stringIDToTypeID('numberOfChannels'));
ref.putEnumerated( charIDToTypeID("Dcmn"), charIDToTypeID("Ordn"), charIDToTypeID("Trgt") ); 
var applicationDesc = executeActionGet(ref);
var theNumber = applicationDesc.getInteger(stringIDToTypeID("numberOfChannels"));
// pixel dimensions;
var theWidth = applicationDesc.getUnitDoubleValue(stringIDToTypeID("width"));
var theHeight = applicationDesc.getUnitDoubleValue(stringIDToTypeID("height"));
var theRes = applicationDesc.getUnitDoubleValue(stringIDToTypeID("resolution"));
var thePixels = (theWidth*theRes/72)*(theHeight*theRes/72);
// process the channels;
var theChannels = new Array;
for (var m = 0; m <= theNumber; m++) {
try {
var ref = new ActionReference();
ref.putIndex(stringIDToTypeID( "channel" ), m);
var channelDesc = executeActionGet(ref);
// collect values;
var theName = channelDesc.getString(stringIDToTypeID('channelName'));
var theIndex = channelDesc.getInteger(stringIDToTypeID('itemIndex'));
var theID = channelDesc.getInteger(stringIDToTypeID('ID'));
if (channelDesc.hasKey(stringIDToTypeID('alphaChannelOptions')) == true) {
var theHistogram = channelDesc.getList(stringIDToTypeID('histogram'));
var value0 = theHistogram.getInteger(0);
// if not completely black;
if (value0 != thePixels) {
theChannels.push([theName, theIndex, theID])
} else {}
};
} catch (e) {};
};
return theChannels
};
//////
function loadAndLayer (identifier, theName, theColor) {
var idnull = stringIDToTypeID( "null" );
var idcontentLayer = stringIDToTypeID( "contentLayer" );
var idchannel = stringIDToTypeID( "channel" );
// =======================================================
    var desc10 = new ActionDescriptor();
        var ref2 = new ActionReference();
        ref2.putProperty( idchannel, stringIDToTypeID( "selection" ) );
    desc10.putReference( idnull, ref2 );
        var ref3 = new ActionReference();
        ref3.putIndex( idchannel, identifier );
    desc10.putReference( stringIDToTypeID( "to" ), ref3 );
executeAction( stringIDToTypeID( "set" ), desc10, DialogModes.NO );
// =======================================================
    var desc11 = new ActionDescriptor();
        var ref4 = new ActionReference();
        ref4.putClass( idcontentLayer );
    desc11.putReference( idnull, ref4 );
        var desc12 = new ActionDescriptor();
            var desc13 = new ActionDescriptor();
                var desc14 = new ActionDescriptor();
                desc14.putDouble( stringIDToTypeID( "red" ), theColor[0] );
                desc14.putDouble( stringIDToTypeID( "grain" ), theColor[1] );
                desc14.putDouble( stringIDToTypeID( "blue" ), theColor[2] );
            var idRGBColor = stringIDToTypeID( "RGBColor" );
            desc13.putObject( stringIDToTypeID( "color" ), idRGBColor, desc14 );
        desc12.putString( stringIDToTypeID( "name" ), theName );
        desc12.putObject( stringIDToTypeID( "type" ), stringIDToTypeID( "solidColorLayer" ), desc13 );
        desc11.putObject( stringIDToTypeID( "using" ), idcontentLayer, desc12 );
    executeAction( stringIDToTypeID( "make" ), desc11, DialogModes.NO );
};

Alpha channels are like selection and layer mask a gray scale channel. All white would be like a select all black like no selection. Converted to a layer they would Gray scale images  that have three channel RGB if the document mode is RGB. One would Target an alpha select all copy to the clipboard and paste in a layer that you should mate tp be associated with the Alpha channel. You would still have up to 53 Alpha channels and up to 53 additional RGB images layers. Would you also want the alpha channels deleted? Or do you was soe other kinf of conversion? Why do you need to convert a channel to an image layer?  Hers a Loade and imags lunionsity as as slecetion. Is saved the selection as Alpha Image Lininiosity.  It targeted the Alpjt channel. Then did menu Select all, Menu edit>copy   Menu edit>Paste.  You can see Layer 1 looks like Alpha Image Luminisoty and has a Red Green and Blue channel. I just don't undetstand what reasion the woul be to do duch a thing.

Could you please post a screenshot with the pertinent Panels (Toolbar, Layers, Channels, Options Bar, …) visible for the source and the intended result?