I got a PFL and IRCC asked to upload response letter in my My CIC account not webform. what are the different between upload in webform and cic ?

[Ruby Vo]

I got a PFL and IRCC asked to upload response letter in my My CIC account not webform. what are the different between upload in webform and Mycic ? My PFL is about https://www.canadavisa.com/canada-i...procedural-fairness-case.760401/#post-9991751