I am also having the same problem since the beginning of October, I have two androids, Samsung S21 Ultra and Samsung Note 8, both have the same problem, but on the Mac I see all the photos as I also do when I use the Mac. I have logged out and re-logged in on one, but still the same message. I am using only 10% of my purchased 2TB and have also cleared the cache on the App. What else can I do?