(I really dislike that I can't just reply in a thread, except by replying to someone, as if I am replying to just them).
So as nearly everyone knows, this issue with the Gallery is still a problem. It's extremely annoying that I can't even look though my own Gallery. I didn't realize just how bad the issue was though, until a little while ago. Normally I keep copies of my sims (and Lots) in my Library and those I can look through with no problems (thank goodness). This morning though I was thinking about which occult sims I wanted to add to my next Save, as townies.
I realized I'd not kept copies of my 6 grand master vampire households in my Library so I decided to grab copies of them out of my Gallery. Shouldn't have been a problem, it can just take awhile to scroll down to them (I have a lot of sims in my Gallery, plus some houses) but guess what, I couldn't reach them due to the duplicating issue. I couldn't even get them to show up via search.
So for some odd reason, I went on the big Gallery and still could not find them (again, not even via search). That led to me looking under my own ID and for some strange reason, I was then able to look through all of my own Gallery uploads... When I found all my vampire households, I saved them to my Library so when I need them, I won't have to jump through hoops to find them again, on my own Gallery...
So until they fix this issue (if they ever manage to), if it prevents you from reaching your own Gallery uploads, then try searching under your own ID, on the big Gallery. I still don't understand why that worked for me but I'm so glad it did.