@Bettina,
Facing the same issue here!

Already adjusted the memory and restarted web servers but still getting the “Invalid reply from server endpoint.”

$ cat  wp-config.php |grep -i memory
define('WP_MEMORY_LIMIT', '256M');

Note: It was working well 2 weeks ago! (last tested in October 2023) and even with 40MB memory limit it was working!

Could you please check if something changed at the cloud library API side?

• This reply was modified 2 years by pravasiexpress.