I've been trying to Post this (see below), but am getting the "error" as seen in the lower-right corner. But I'm not really uploading anything but a couple of lines of text and a Link to a Video. It's been giving me that message for a couple of hours. I started-over, too, but it didn't help. 😕
Image Source: Me
I don't know what causes this 🤷♂️ Can you first post without the video link? Perhaps you can add it later through "edit" or in a comment.