Steve –
IT IS YOU …. Or perhaps lack of clarity on my part.
You are presenting the clip the wrong way round. i.e. the “long” end (currently between your thumb and finger) is the end that goes into the oval shaped hole in the door.
BUT – fist of all you have to attach the other end of the clips to the channel – as described in my second paragraph, above –
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– and then offer the lot to the door as an assembly.
I removed my interior window trim to take the following pictures of the top edge of the door frame, looking up from the aperture where the glass descends into the door.
If you download and zoom in, you will see the “tail” of the clip needs to be “fettled” to pass into the slots and hold the channel at the correct angle.
.
Good luck – again.
B.……….