Uploading files larger than the default 8 MB using the DotNetNuke file manager or the upload capabilities found in most modules (such as Media or Gallery) will require modifying the values for the maxRequestLength and requestLengthDiskThreshold attributes in the site's web.config <httpRuntime> node. You may also need to add (if not already present) to the httpRuntime node the attribute executionTimeout with a value larger than the default which I recall as being 110 seconds.

Here's some MSDN documentation on the <httpRuntime> node attributes:

http://msdn.microsoft.com/en-us/libra...

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Bill, WESNet Designs
Team Lead - DotNetNuke Gallery Module Project (Not Actively Being Developed)
Extensions Forge Projects . . .
Current: UserExport, ContentDeJour, ePrayer, DNN NewsTicker, By Invitation
Coming Soon: FRBO-For Rent By Owner