question to admin about security error I'm getting

[roymil]

Hello,
normally I dont have any problem but tonight for some reason I'm getting this error when I try to reply to a post.  I am posting with a .png , but I've done that fine plenty of times.   wondering what to try next.  thanks for any help. hopefully this query posts.   regards, Mark

Your attachment has failed security checks and cannot be uploaded. Please consult the forum administrator.

[Peter van Es]

Make sure the PNG is a proper PNG, not a renamed file with a different content. Make sure it is less than 4MB.

Open the file in an image editor, reduce the size to 1280 pixels on the longest side, and then save / export it as a .jpg file and try and upload that.

If that fails, e-mail the file to admin@sl113.org for investigation.

Peter