As per the information shared above, what does it means by turn off? Are you referring to the application or the website, through which you are accessing the "Document Cloud"?
Try accessing the files online via- https://documents.adobe.com/
Or if you are accessing it through the Adobe Acrobat DC then you may check under preferences settings whether its enabled or not?
Acrobat >Edit>Preferences>General> "Show online storage when opening files"
Hope this helps.