Hope this will helps:
Receipt: No need for additional page. Just fill what is asked in that receipt.
While raise CSE: We can attached additional document.
What i did: I scanned everything in images. Placed them in 2 files because i had to send renewed passport, rprf and PCCs. I had around 12 images. As we have size restriction, i had to put them in 2 word files. we have to watch out for size of each file as well as total size for all files. Then i attached in one cse and sent it.
Acknowledgement: Most of us received in 2 weeks but for some it took time but it reaches them hence no need to worry. if needed they will ask again.
In my opinion, sending via cse as well as post will confuse and double work and delay.