I can’t upload photos to a Blogger.com post: why?

Ever since updating to macOS Tahoe 26.2, Blogger refuses to let me upload photos to posts on Blogger.com.

There’s some sort of issue with cookies, I’m told.

Google’s Help pages tell me this:

Tell me to make sure — in Safari’s preferences — that Cookies aren’t blocked for google.com.

Except, of course, there’s no such listing in Privacy, or in the Advanced Settings.

https://www.youtube.com/watch?v=cFfR693ezAc

How do I solve this?

Clearing Caches, Cookies and history, doesn’t work. The problem doesn’t happen with Firefox, Chrome or Tor.

As a last thought?

What ever is causing this issue seems to log me out of Facebook, X and Quora: and probably other sites