When attempting to change logo on the liferay portal settings, keep getting error

Document ID : KB000122281
Last Modified Date : 04/12/2018
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We keep getting - "Portal Settings is temporarily unavailable." whenever we are attempting to change the liferay logo on our portal site. We would like to be able to change it. Any advice on how to do that or how to fix this issue with the portal?

Portal Settings is temporarily unavailable.
- UIM 8.5.1 SP1
- UMP 8.5.1
- Unknown

In UMP Control Panel->Portal Settings->Display settings, right under the Logo section, there was no logo present BUT two options were displayed, for "Change" or "Delete."

How can there be a Delete option present if there is nothing displayed?

Therefore, I clicked Delete and the missing company_logo.png immediately showed up. I then pressed the Save buttonĀ under the Display Settings to save it.

Log out of UMP (liferay portal), then log in and the company logo was now displayed in UMP and remained persistent.