Can't find docs on Pages for Mac

I use iCloud to sync all my documents. This includes Pages docs. Everything was synced on all the devices until I installed High Sierra on Mac Pro 3.1 (Early 2008).

When I open the Pages app for the Mac I cannot find the synced docs on iCloud. Of course I see and edit them on the other devices (iMac, MacBook Pro, iPad, iPhone).

I tried to delete all the docs and upload them again on iCloud via iCloud.com.

I tried to delete the Pages app from the Mac and install it again.

I tried to delete all the docs and upload them through the finder on Pages folder of iCloud.

The iCloud Drive does includes the Pages folder right?

When I save a doc from the Pages app for Mac to the Pages folder of iCloud it saves it local.

What is going on here? Please help me!

Thank you.