Update:
* I had said that when i login online, "I do not see a copy of my submitted application", and I also said I see an "Unsolicited Evidence" filename "MYRECEIPTNUMBERANDSOMESTUFF-part1.tif", well, evidently that IS my submitted application. I clicked on it, a 24M file was downloaded, and it's one file showing a snapshot of my aunt's GC, but as i scrolled further, it has most everything i mailed into when applying N-400.
So, perhaps your "random page of a document", download it, try scrolling through it, see if it's multiple pages of the items you 'mailed' in.
* Your second point that you did not get your "receipt notice on my uscis account". But you did get the 'physical letter' in the mail. If you have not already, you can ADD the receipt number on the letter from the mail you received to the online USCIS account.
Simply login, click on "My Account" on top left side, and select "Add a paper-filed case" and enter the receipt number.