JPG Photos won't upload

I’m trying to load photos from our last campout and, previously, another event. When I drag/drop OR select, the photo appears briefly with a progress bar, then disappears, and never posts. I’ve waited several minutes, changed computers, and file sizes are all below 1 MB. Anybody have an idea on this? I have posted before, and others have posted successfully as well. Is it me?
I see a similar post that has been unanswered, and that one says they are seeing “broken images”, but mine won’t even upload to get broken…
Troop 166 Lakewood Colorado