"He who marches out of step hears another drum." ~ Ken Kesey
You need to tape it to your glass. Buy gorilla tape holds really well. Doesn't have to be taped so the hulk can't get it off but just nice and secure all the way around. I like puttin a couple on the inside and some on the outside. You will love it! Also when you are aligning your film. Make sure you put the carrier sheets ON TOP of the film then tape. Found it is better that way.
Laying the film on top creates a little bit. Of a ramp effect from the film laying on top of the carrier to the glass. When you put the sheet on top of film you have the whole film flat on the glass. I liked it better that way, and helped us out. Like anything. More than one way to skin a cat. Also make sure you tape both sides of the film and carrier.
I agree with johns last 2 posts