web.config is in the root directory of your DotNetNuke installation. ALWAYS (!!) make a backup copy before you edit it. ALWAYS!
"There is a file size limitation in the default web.config. You can
increase the file size easily. You may wish to adjust the timeout
setting as well. Here are the default lines from the web.config for
4.3.2:
< !-- allow large file uploads - ->
< httpRuntime useFullyQualifiedRedirectUrl="true" maxRequestLength="8192" requestLengthDiskThreshold="8192"/ >
Change the
maxRequestLength and requestLengthDiskThreshold to whatever you wish.
The default timeout is in the machine settings but you can override it
here. So here's an example, you could change it to this to allow 10
meg files with up to 20 minutes of time to upload:
< !-- allow large file uploads -- >
< httpRuntime useFullyQualifiedRedirectUrl="true" maxRequestLength="10240" requestLengthDiskThreshold="10240" executionTimeout="1200" / >"
This tutorial might be useful:
DotNetNuke File Manager