1.There will be a section Client Information, just combine all your additional documents and upload it there. Keep in mind you might have to reduce the size of the file.
2.You dont need medical for OWP or even PR because you have already had it in 2022. Medicals are valid for 5 years as per the current policy.
3. Usethis link for your 5710 queries
https://www.canada.ca/en/immigratio...ication/application-forms-guides/imm5710.html
I have followed this link to apply for OWP with AOR -
https://www.canada.ca/en/immigratio...mmon-law-partner-canada-open-work-permit.html.
Also watch this video it will be helpful
As
@alex00 said you can wait 1-2 months more before applying for OWP, if there is no urgency.
Hope this helps.