Trying to post a question and this popup is stopping me

Hi QuickSloth​ thanks for raising this, it looks like a bug, which I'll report immediately.

How are you adding the image? Does it make a difference if you upload the screenshot as an image from computer, rather than copy and paste?

You can add images using the Insert Media button in the Content Editor toolbar, drag-and-drop, or by copying and pasting.

I've seen a similar issue before when pasting content from another source (like Google Docs or Word), sometimes hidden HTML or unsupported formatting tags can transfer over and trigger this error.

What happens if you upload a different image - do you still see the error?

Thanks!

QuickSloth​ I'll also add that in the icon bar, if you click ... and then <> you can see the htlm of your post and remove anything invalid.

Hi QuickSloth​ I notice that you managed to get around this in another post. 

Would you mind sharing what you did differently the second time around, so I can keep investigating, please?