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.
This is so embarrassing.
Yeah, it's crazy that they haven't fixed it yet.