Share your experience!
I updated my z3 compact to Android 6 and could see following 2 issues:
1. If only 1 file is selected Direct-Share ist not working, no contacts are being shown, if multiple files are selected then it works, it does not matter from what app I try this.
2. In settings there is a Support Menu, where as here you could access the support forum, then you can login with a few accounts like Google, if you select Google you get a JSON error string in the browser:
"Expected request parameter missing : CC"
status: 114
I have the exact same issue with direct share on my Z3 Compact (D5833). Test is replicable by selecting only 1 photo and sharing = no direct share contacts. Select 2 or more photos = direct share with frequent contacts. It's annoying because I usually share a link to my frequent contacts and this way it doesn't work.
I too have this problem. I don't understand it, because it's a common Marshmallow-function. It looks like something of the Sony software breaks it 
Too bad, I was using the Concept software before and gone back to Sony's official firmware because of the extra features. But I really like Direct Share. What to do? 
I'm having the same issue Xperia Z5 E6653 32.2.A.0.253