I emailed with Bill to troubleshoot; just sharing my summary note…
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I do see what you’re describing, where the .jpg version is appearing but the .png version isn’t, and I really appreciate you raising the issue. I’m not able to say exactly what’s going wrong, after looking into it.
The forum does allow .png files, and I tested uploading a couple, including yours, and it worked ok.
So, I’m afraid I have the un-satisfying reply right now that I’m not sure what it was, but I’ll keep watching it, and please email me if you hit this issue again. My only working theory was that the sum of the file sizes (attachments) exceeded some maximum, but that doesn’t make sense to me because the files just aren’t that large.
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