I am trying to upload an Mp3 file using the media manager, the max file size is displayed as 4 MB. When I look in the webconfig file I see this: maxRequestLength="8192" requestLengthDiskThreshold="8192" How come the max size is only 4 MB in the media manager? I am running DotNetNuke Community Edition DotNetNuke Version: 5.4.0 which has the new Telerik RAD controls.

For larger files, I almost always find it easier to use FTP and do it directly.

As to your question, I'm not entirely sure of the answer.  But, you could try increasing the executionTimeout parameter, too.

< httpRuntime useFullyQualifiedRedirectUrl="true" maxRequestLength="10240" requestLengthDiskThreshold="10240" executionTimeout="1200" / >