I think Jive needs a huge UI/UX redesign. There are a number of things, including your issue, that just don't make sense when it comes to design.
Hopefully future releases will correct these issues.
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Seems it's a known issue.
On Wed, Dec 21, 2016 at 2:03 PM, Mat Wojdyla wrote:
PDF thumbnails in News Streams are linked to themselvesnew comment by Mat Wojdyla View all comments on this case
Thanks for contacting Jive support; I will be assisting you with this case. It looks like you have discovered a known bug with upload thumbnails and Jive streams. JIVE-75444 has been added to this case for tracking and you can view its status on the right side of this case.