Well, after lots of searching, it seems this has something to do with permalinks. But I fiddled and changed my permalinks and never could get it to stop making posts out of media files (vid/audio, jpgs)
After much messing around, I’ve come up with a workaround for anyone else who has this problem. It’s not very good, but beats having posts with nothing but a picture (that is already in a post).
I made a new category called pix, did an exclude in the list categories on the sidebar so it doesn’t show up. I would make a goof post, choose pix as the category, add the file. It would still show up under my default category listing page.
So….
1. Change default cat to pix, do the goof post, add the file.
2. Change default back to my preferred cat (this is optional, but easier for me)
3. Do my post, add the file from the media library. Done.
It still shows up as an individual, extra post in the pix category, but since I hid that via exclude, nobody but me knows it’s there. If Google finds it, I don’t care.
Since I rarely add images or media files to my posts, this cumbersome workaround is the best option for me. For someone who uses a lot of media files, it would drive you to insanity.
I also tried keeping my default cat, and doing a goof post putting it into pix category, but it still would put the picture post in my default listing. There was no way to change it.
This sounds kind of complicated, and I guess it is, but it’s the best I could do. It’s easier than manually uploading a file via FTP, then doing all the image/thumbnail code by hand.