The pdf would have a application# (starting with C)on the top right hand corner. The application# is generated at the time of the AoR
What it basically means that the documents you have submitted are complete and they will initiate further processing..
If they require additional documents eg police clearance certificate or translation of any documents which are not in English or French or passport copies or event requiest you to submit finger prints, etc., they may still ask you
But all in AoR is a good first step in the right direction
I shared a post earlier outlining generally the process forward
https://www.canadavisa.com/canada-i...21-citizenship-applicants.733273/post-9792298