Hello,
I have a new UCP Wiki and anticipate many images, Will multiple image uploads be allowed?
I agree with HumansCanWinElves. I was told several times when adopting a Wikl that the previous Bureaucrat was stripped of Bureaucrat and Admin rights as standard practice, Once, when that didn't happen, I notified the staff member and he said he forgot and took care of it right away.
For starters, your gallery tags are contained within nowiki tags. Use the source editor and remove the nowiki tags.
Update: Sorry already answered...
You need a Horizontal layout Group in the template such as:
<group layout="horizontal">
<header>Navigation</header>
<data source="previous"><label>← Previous</label></data>
<data source="next"><label>Next →</label></data>
</group>