Unable to share files when in a IM convo with multiple people Lync 2013

Hello,
I'm in the middle of a migration from lync server 2010 to lync server 2013. The users I have migrated over to lync 2013 are not able to send/share attachments when in a convo with multiple people.
However, users can send/share files when IM'ing with individual people.
I've been researching this issue for quite some time but still having a problem pinpointing the issue.
Any help would be greatly appreciated.
Thanks.

Hi,
Did the issue also happen between users who still in Lync server 2010 pool?
Did the issue happen internal or external?
Please double check if MCU on Lync 2013 FE server works well, when two participants are connected, the session is essentially peer-to-peer. When three or more participants are connected, the Sharing feature depends on the Front End Server Multi Point Control
Unit (MCU) to provide the sharing stream to all parties.
Best Regards,
Eason Huang
Eason Huang
TechNet Community Support

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