Push down and across !!!!!!!!!
Is it just the trim that's coming out or the door barrel itself.
You can sometimes get it to click back on with firm pressure but if the clip is broken you'll need to replace it. Best way to check though just wip the barrel out, just inside the door there's a little plastic cover, remove it and you'll see a 15 (maybe's) torx screw,unwind the screw until you feel it getting tight again, whilst doing so wiggle the barrel and it might pop out, if not give the screw a couple of turns as if to tighten and push on the end of the screwdriver and this should release it. The clip is obvious when the barrel is out !!
2004 A4 Avant
Akoya Silver | 2 Graco Car Seats | Buggy In Boot |