Q: Add photos to shared stream

Hi all.

Hope my English be comprehensible :-)

Yesterday evening at home I created a shared photo stream from within iPhoto on my Mac Book Pro (Mountain Lion, iPhoto & Aperture all with last updates).

I added two shots and shared them with one of my collegues adding her Apple ID. This morning she showed me the shared photos on her iPhone, as expected.

Now she can add a comment (this is ok) but she cannot add a photo to that stream: this is not a serious problem, but I wondered if it is possible to grant her some additional permission.

I looked in Apple documentation and found 3 links with different answer to my question.

Look here:

from http://support.apple.com/kb/HT5902?viewlocale=en_US

Can my friends and family add photos or videos to a shared stream that I created?

Yes, if you allow it.  When editing your photo stream to add or remove subscribers, you can turn on the option to allow subscribers to  add to your shared stream. Subscribers can contribute photos and videos to your shared stream if they have  an iCloud account and a compatible device with up-to-date software.

But look here:

from http://support.apple.com/kb/PH11957

Note:   You can add photos only to photo streams you create. You cannot add photos to shared photo streams you subscribe to.

and here:

from http://support.apple.com/kb/PH11964

Note:   You can add photos only to photo streams you create. You cannot add photos to shared photo streams you subscribe to.

May be I'm missing some detail or misunderstand contents.

Now I'm at work, so cannot access my MBP, anyway I do not remember to have seen such an option when adding subscribers ...

How does it really work ?

Many thanks !