I e-filed my COS H1B to F1, but have not received receipt to mail documents


I applied for my COS through the E-file USCIS elis system. I read it some where that you need to mail you supporting documents in 7days after file submission. All the mailing details would be mentioned on the final confirmation receipt.

I am able to view my application packet online but i do not see a receipt or a document with instructions as to where should i mail my suuporting documents.

Has anyone encountered this issue or does anyone know what the next step is for the same or what happens next?

Thanks for your time all seniors.