Use iCloud Drive and share document with different MacBook Pro - Hight Sierra and El Capitan

Hi,

I have a two macbook pro, mid 2009 (El Capitan) and late 2016 (High Sierra)

with High Sierra I can share the documents and desktop folders, with El Capitan, this option is not exist.

How can I share the desktop/documents folder for these laptop?

If I use iCLoud Drive with both, i have two document folders in El Capitan Macbook pro (mid 2009).

1 --> iCloud Drive > document folder

2 --> myComputer > users > myUser > document folder

Even with desktop folder

This creates a bit of confusion.

Do you have any suggestions?

Thanks for any reply.

Emiliano

my device

MacBook Pro, Mac OS X (10.6.8), 2.8 ghz 8 gb ram

MacBook Pro (15-inch, Late 2016), macOS High Sierra (10.13.2)