I am experiencing precisely the same problem! It all started today, Dec 20, 2024.
I have reported this issue and was given a case number.
I will update my post when this misfortune is resolved (let us hope it happens sooner than later..).
It is indeed utterly frustrating not having access to your files on line, especially when you pay (!) for this service..
[Post updated on the 22nd of Dec 2024]: Everything returned back to normal as incomprehensibly as it had occurred in the first place.. Judging from the posts of many other users in this (and more ones) forum with respect to vanishing of one's files and folders, it appears that this kind of malfunction is a repetitive one and NOT an isolated mishap.