I edited the code just a little :

{

app.beginUndoGroup("Pre-Compose to Layer Duration");

var myComp = app.project.activeItem;

var copySelected = myComp.selectedLayers.slice();

if(myComp instanceof CompItem) {

var myLayers = myComp.selectedLayers;

if(myLayers.length > 0){

var newIndex = copySelected[copySelected.length-1].index;

…

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Thank you so much!

I would ask 2 more things and I woulf be greatfull if you can answer them.
now I made the inPoint and outPoint the same as the selected layer and it works,but if I selected multiple layers and do the changes in photo2, it will give me an error,I think I can’t change the inPoint value even if I declared it as a variable so how can…

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Hi, is there anyway to change the index of the layer after adding it from a script ?

I tried this way as it’s shown on line 6 ,but it doesn’t work.