@Autismum4 yeah I always send it recorded as my first ever claim didn’t arrive (I put it in the post box!)
I’m sure if you’re not happy with the decision or if you disagree then you can ask for a Mandatory Reconsideration. The claim gets looked at by another DM and I don’t believe you have to send off further evidence at this stage. I could be wrong as I’m hoping we won’t have to appeal!
DS has a rare genetic disorder and has weekly appointments. I’ve probably sent off about 50 pages of evidence!🫣 if you think it’ll help your DC’s case then I’d just send it anyway. Hopefully you won’t have to go through the appeal process at all. I understand why you’re thinking ahead though. It’s a tough one!