I'm sorry to hear about the banner upload issue. It sounds like you may be running into JIRA bug JIVE-60794, which is fixed in Jive 8.0.3. Could you please confirm which version of Jive you're using?
In the admin console it shows Jive SBS 220.127.116.11 9c1.2
Senior Systems Administrator
From: Jeph Yang
Sent: Wednesday, September 30, 2015 10:53 AM
To: Keith Teach <email@example.com>
Subject: New message: "Place template management - Manage
Jive Community <https://community.jivesoftware.com/?et=watches.email.thread>
Place template management - Manage template banners
created by Jeph Yang <https://community.jivesoftware.com/people/jeph.yang>
in Jive Support - View the full discussion
I apologize for the delay getting back to you. They version you've identified confirms you're on Jive Cloud, which is reported against the identical issue but under JIRA bug JIVE-62235. This is reported as fixed in 2016.1, which is the version slated for early next year.
I hope this helps. Let me know if you had any other questions on it.