I am intending to apply for postdoc at an institution. I already am acquainted with the potential adviser (we know each other). I already have contacted him expressing my interest in joining his group. However, the institution calls for regular open announcements for postdoc positions and I am particularly interested to pursue under his supervision only. So he advised in his reply to check for the open announcement. Now the applications are called for and a research proposal is needed to apply. I have made a proposal that is in sync with his area of interest (in which I am interested too).
I am really confused whether it would be wise or even need to email a copy of my research proposal to him, as the institution hires postdoc candidates through a common application procedure. Or is it enough that I just apply via institutional procedures and then send an email informing him that I did ?