var doc = app.activeDocument;
var textFrame = doc.textFrames.add();
textFrame.position = [0, doc.pageHeight];
var textStyle = textFrame.textRange.characterAttributes;
textStyle.size = 12;
textStyle.fillColor = doc.swatches[0];
for (var i = 0; i < doc.placedItems.length; i++) {
var placedItem = doc.placedItems[i];
var fileName = placedItem.file.name;
textFrame.contents += fileName + "\n";
}
textFrame.textRange.paragraphs.everyItem().autoLeading = false;
textFrame.textRange.paragraphs.everyItem().leading = 12;
textFrame.fit(FitOptions.FRAME_TO_CONTENT)
console