I can't upload photos from Photo to internet sites

There is no media heading (screenshot). I should say that I had trouble with Catalina (disaster really) and the Apple advisor had me essentially wipe my hard drive, install Mojave, and then reload my data (including photos) from my external My Passport. I don't use iCloud if I can help it....the computer seems able to access the Photo Library (which is greyed out, meaning it's selected) and roll random photos as a screen saver...and if a photo is on my desktop I can upload it, either to a site like Facebook or to another program on my hard drive...before the disaster, sites like Facebook were able to pick up photos from the Photo Library...some kind of linkage or setting seems to have gone wrong...and...where can I find that Media heading? Thanks for your help.

Oh HEY!!!! Thank you! We are really kind of duh, duh, duh out here...So that was it...just not scrolling down far enough and somehow thinking "Pictures" meant ...well, pictures :). Thank you again, Terence!