firstly, congratulations on receiving the CoPR.
Secondly, if i understand you right. Post receipt of ITA, filing the PR forms, uploading the requisite documents against the checklist generated, new section appears for uploading LOE?
Uploading LOE on each part means you have prepared and uploaded the LOE for each of the document set? like for education separately, employment separately, POF separately etc.?
Can you share one of your LOE if you are fine with it? via email i will PM you separately post your consent