I was trying to upload this image when asking an question, but I got the following message when pressing "Add picture" after selecting "From my computer" and browsing the file (you need to download the image first to repro):

For security reasons, framing is not allowed; click OK to remove the frames.

Then I clicked OK and presented with a question:

You have started writing or editing a post.

Are you sure you want to leave this page?

If I press "Stay on this page", the dialog continues the "Uploading..." animation.
If I press "Leave this page", I'm redirected to your This is our fault error page.

I would expect you to say the file is too big or something more pleasant describing the problem, not redirect to a generic 503 page.



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