In NS file cabinet , I have folder full of image files Every image is unchecked with the available without login check box . I could not render any of those images in adv pdf template. How do I make it checked ? Any suggestions?

You can try this under File module

var fileObj = file.load({
    id: 'Images/myImageFile.jpg'
});
fileObj.isOnline = true;
var fileId = fileObj.save();