So I was trying to increase the file size limit for the uploads and I noticed that setting the 'MaxSizeUpload' variable to anything different was not taking effect, so I scrolled down in the file and I found the setConfig function that replaces all the variables but the ignore array is empty so all my custom settings are being overridden.
Line 364:
\CoasterCms\Helpers\Admin\FileManager::setConfig($config, ['MaxSizeUpload']);
That helped me to keep my variable as I wanted. Not sure if this was intended or I'm just setting my variables wrong.