Have you been checking account regularly, some people miss this change. Also in your case they asked for additional documents, so it will take time I think, it takes 30-45 days these days for CIC to upload your additional docs. The day your status changes to, The additional documents you provided are uploaded" then you can be sure that they have received your additional documents. the status you mentioned for additional docs is in every file it reflects nothing as it was an anomaly introduced in all files after changes in June. Keep checking your account regularly.
You can also call CIC to ask status of your additional documents, I have read it triggers them to upload the same in your file quicker.
As for IP1 and IP2, please read the post below-
When your background changes from "not applicable" to in progress for the very first time (usually around your medicals pass) it is IP1. You will receive no e-mail notification for this (or mostly any change in background at any stage) and the only way to check this is by checking your account for updates as sometimes it very quickly changes back to "not applicable" and is missed by applicants.
Please read following for details.
Stages- AOR>Meds pass>IP1>NA (Not applicable)>Ip2>PPR.
IP1 refers to in progress 1 i.e when your background goes in progress for the first time. This stage your R10 check (completeness of documents is checked). It happens simultaneously with the medicals and both are independent of each other. They both generally get updated at the same time in your file give or take few days. So after your meds pass it will be around the corner..
After R10 is complete your BGC will change to NA. After this your eligibility and criminality will be checked, if all is okay file will be transferred to LVO or CPC. Then comes IP2.
IP2 refers to in progress 2 i.e when your background goes in progress for the 2nd time. This happens generally after 10-35 days from NA Stage. Here your file is finalised for eligibility, security and criminality and PPR is generally issued after 2-15 days from this stage, if all goes well of course.
Note- timelines vary for different applicants as each case is unique and processed differently from other, these timelines have been deduced based on the current trends for normal average cases (FSW-O).