HowTo: Adding pictures to posts

Is is not possible to [Edit] a post and put pictures in?
I just tried to use EXACTLY the SAME process I use to post the test picture above, but it was in the original post of a couple days ago.
I use the EXACT same URL for the image itself, pasted in the “Insert Image” link and it did not work perfectly for me. It didn’t work at all.

When I click [ok] a box pops up that Says [This page is asking you to confirm that you want to leave - data you have entered may not be saved.] and asks me if I want to [Stay on……or……Leave the page].
Neither choice works. Stay does nothing, just sits there with the [Insert Image] menu open.
Leave makes the box disappear, a ghost icon shows up in the post that appears useless.

That’s what I was dealing with the whole time yesterday.
So, I cannot edit that post to add pictures like a new post?

Addendum-a little later:

OK. I [Saved] this posting. Now I came back later (actually closed the forum to make sure) and did EXACTLY the same thing I tried in the original thread.


I think I’ve demonstrated I can make it work here. I’m not doing anything different there.

Why does it work in this thread, and not in the one I want to post it in [New cheap 26650 diving light at DX] post #46?

NEVER MIND - see post #28 below.