Cannot Paste Images

When I attempt to Reply to a post and attempt to paste an image from the Windows Clipboard, a message comes up, "Media Upload in Progress. Please try again in a few moments."

(I would post a screen capture of the message, but that is impossible!)

This happens with the following web browsers:

Windows: Brave, Chrome, Edge, Firefox, Opera

Mint Linux: Firefox

Chromebook: Chrome, Firefox

Really annoying!