Are you sure you still need to submit? Read this from the Quebec immigration website...
Changes to document requirements regarding the “Professional experience” criteria – Regular Skilled Worker Program
November 25, 2015 – The Ministère de l'Immigration, de la Diversité et de l'Inclusion has modified its rules regarding document requirements for applicants in the Regular Skilled Worker Program. From now on, applicants are no longer required to systematically provide proof of the legality of their professional experience (e.g., proof of social contributions or income tax assessment). However, they may be asked for this proof at any time during the processing of their file.
In addition, note that the “Professional experience” criteria will continue to be evaluated based on the same criteria as before. The work experience of skilled worker applicants must have been acquired:
during the five years preceding the date of submission of the application for a Certificat de sélection du Québec;
in an occupation with a competency level above “D” according to the National Occupational Classification (NOC);
legally in the country or territory concerned.
The changes made to the document requirements apply to all applications received by the Ministère as of November 25, 2015, as well as all applications received before this date and for which the preliminary review has not yet begun.