In the past, I've used free pictures downloaded from Bing. (I used to do the same thing on Goggle.) I used to try to use pictures from free-picture websites. However PC frequently blocked them saying they lacked a "security chip" (whatever that is.)

I've never been able to figure out a way to copy & paste pictures directly from the source onto a thread here on PC. I've always had to first paste them into my albums & then copy them to the thread I wanted to reply to. The only problem with that is, if I later-on delete them from my albums, they then disappear from the thread I replied to as well.

The other problem I've encountered is that I have Malwarebytes Premium on my computer. And with some pictures in particular, whenever to try to download a picture, I get a notice saying that Malwarebytes has blocked some malicious website or other. I found this to be particularly the case when I would try to download bear pictures. They seem to be rife with malicious software. Consequently I've pretty-much stopped downloading new pictures... especially bear pictures, of which I used to download quite a few.

Anyway... that's what I can tell you about the process. I'll be interested in reading other members' replies to your post. Thanks for posting this!