How does one change this?

When trying to upload, my prompt is

Accepted file types flv, f4v, wmv, mpg, mpeg, mp4, mkv, m4a, m4v, 3gp, mov, avi, webm, ogg · Max file size 20MB

My group settings are set to unlimited.

Any advise appreciated, thank you. 

https://www.dokuwiki.org/faq:uploadsize