How to get iCloud Drive to work properly?

Question

iOS

There are three pieces of iron: MacBook, iPhone, iPad. Everyone has one AppleID and one iCloud account.
Synchronization is enabled everywhere, everyone is in the same Wi-Fi network.
On the MacBook, I uploaded the files to iCloud Drive, on the iPhone they appeared and were available, synchronized almost instantly.

I go to iCloud Drive on the iPad - it's empty there, some old versions in general.

I go to the settings and see the following picture there:

What should I do? I want to see them there in this way, why doesn’t it work, where to poke?
By whom and how are the files encrypted and why are they not visible?

Answer 1

All in all, I don't know what's going on here. I connected the iPad to the computer with a wire - everything turned out to be buggy, it turned out to be a curved wire, I took another wire - everything was synchronized and it all worked. Magic, damn it.

Answer 2

Similar claims to iCloud Drive, it works slowly and according to some of its own laws ... Versioning is different on all devices, minimal changes of 1 MB have been updated for years.