Photography

postimages was doing that to me not long ago. When I'd upload a file it was ending in avif, not jpg. I came to realize that was because when I'd go to upload a file I would click on Choose images first. That brought up a picture of my desktop and I would choose the file by clicking on the file then on upload.

And every time the file would end with avif. When I went to save it as a Direct link, it came out on the Photography page as numbers and letters.

So I tried instead to place my mouse on an image on the desktop and dragged it straight into the Choose images box. And it worked. Followed the rest of the process and now every attempt ends up with jpg on the end, which becomes the image again when pasted to Photography.

Don't know what postimages has been doing with your images, but in this instance it was a simple fix. I hope this all makes sense. And that you can get another chance for postimages to work for you.