After much research on the network I have come to a thread of Apple users in which a solution was given to a problem that I was having with the display of certain documents within iCloud Drive. The problem that we are going to solve today appears if you use iCloud Drive on your Mac and create folders in it from the Finder.
Any Mac user who has decided locate your documents in iCloud Drive what you will have done is copy the files and folders and paste them into iCloud Drive. If you have also done that, the problem that we are going to talk about is surely happening to you.
When a PC or Mac user is generating files on their computer, the most normal thing is that if it is moderately organized, they create folders and file subfolders. Now, if you have decided to locate all your files in iCloud Drive, you will have to do a folder restructuring before doing so since, for now, the iCloud Drive system only allows iOS devices to read only one level of folders.
That is why if within a folder we have another folder and within it Pages, Numbers or Keynote files, the files in that internal folder are not going to be seen in any way. You will have to remove the files to the main folder to be located by the iOS system.
As we have indicated, you will only run into this problem if you move a hierarchy of folders from the Finder to iCloud Drive since if you enter an iOS device and you try to make a folder inside another the same system won't let you.