Share option not available!

Dear Friends

I have installed the oC in ubuntu server step by step from this web site

Every thing works file except when Im trying to share a follder there is no option for that.

Please have a look at screenshots.
Vert strange while I have installed oC 8 and there is a share button.


Sharing settings

Did you enable the file-sharing app?


Very strange that I have disabled!!

Thnx a lot!

where can i find the app to activate it? Thanks