@andrew84 Yes! That's more or less the issue I was having! The clipboard wasn't appearing for me to select the files. I do have auto hide sidebar on but I've always had it on. The issue only started a few weeks ago. However like I said, It wouldn't be permanent and if refresh the page or navigate away and return to try again, it would be fine. This is how I found a solution I posted above this post to Leo - when I was able to select a file from clipboard I'd select "don't show this pop up again" and now I'm able to select files from the folder popup instead. Thanks for this.

@alex36xp There's something peculiar with that site. The https link you posted pops up in various browsers as "Not Secure" or "Not fully secure" or "Unencrypted connection", even though the connection shows as https and the site cert shows as valid. Apparently, the site server is unable to successfully establish an encrypted connection for some reason. Whether or not that relates to your specific problem, it implies something is out of kilter with the site... or just plain sloppiness on their part.