Hey man,Since you have already updated all of your work experience, you should upload reference letters for all.
To dig deeper, you have to upload reference letters for the number of years you have claimed under FSW to score 67. That's mandatory. Else, your profile will be rejected on the grounds of "FSW not met".
FSW is clearly mentioned under : https://www.canada.ca/en/immigratio...ntry/eligibility/federal-skilled-workers.html
Once you clear FSW, then for CRS, one gets maximum points for 3 years of work experience. To clear this stage, you will have to share reference letter for 2015-2018 and 2018 - Till date. But if in FSW, you have claimed more than 3 years of work experience points, then you need to provide more reference letters.
Which also answers your question about primary NOC, if you are going before 2018, what's the harm in keeping NOC 1112 as your primary NOC???
Thanks a lot for your detailed response. I selected 1112 as primary NOC but when I read the lead statement, it mainly relates to investment firms even though some responsibilities match that. I hence thought I can change the primary NOC to the current one which matches the lead statement. What do you suggest? Should I change primary NOC? Or would it attract attention?