Generally all actions should be written in a separate code line:

if (NumericField1.rawValue > 0) {

    xfa.resolveNode("Image1").presence = "visible";

    xfa.resolveNode("Rectangle1").presence = "visible";

}

Try

if (xfa.resolveNode("form1.#subform.#subform[1].NumericField1").value.on eOfChild.value > 0) {

            xfa.resolveNode("form1.#subform.#subform[1].Rectangle1").presenc e = "visible";

}else{

          xfa.resolveNode("form1.#subform.#subform[1].Rectangle1").presenc e = "invisible";

          }

Well, the problem is you're trying to control objects on the body page and a masterpage at once.

This is generally not so simple to accomplish.

I changed your form a bit.

The paperclip image and the numeric field now monitor the valur of the numeric field and change the wanted property if the value is larger than 0.

Script for the paperclip (wrapped in a subform)

form1.Page.#subform[0].NumericField1::ready:layout - (JavaScript, client)

 

this.ui.numericEdit.border.fill.color.value = this.rawValue > 0 ? "255,255,153" : "255,255,255";

Script for the numeric field

form1.#pageSet[0].Page1.Clip::ready:layout - (JavaScript, client)

 

this.presence = xfa.resolveNode("Page.#subform.NumericField1").rawValue > 0 ? "visible" : "hidden";

Script for the remove button

form1.Page.#subform[0].Button3::click - (JavaScript, client)

 

var myDoc = event.target;

var sFile = ListBox1.getDisplayItem(ListBox1.selectedIndex);

 

try {

          if (sFile !== "") {

                    var nResponse = xfa.host.messageBox("You are about to delete the highlighted attachment. \n\nDo you want to continue?", "Deleting an Attachment", 1, 2);

                    if (nResponse == 4) {

                              myDoc.removeDataObject(sFile) + ListBox1.deleteItem(ListBox1.selectedIndex) + (NumericField1.rawValue = NumericField1.rawValue - 1);

                    }

          } else {

                    xfa.host.messageBox("No document selected.");

          }

} catch (e) {

          xfa.host.messageBox("Error in removing document");

}

https://acrobat.com/#d=55A3x-8Zm7D29eK7*brqxQ