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InfoPath Form Attachments

If you have an InfoPath form in an InfoPath Forms Services library and one of the fields in the form is an attachment field you may get an error when you attempt to attach any files larger than 5MB when viewing the form through the MOSS web interface.  You will get this error even though the Farm is configured to allow much larger file attachments on document libraries and other upload routes? 

The error reads 
"The selected file is too large and is causing the form to exceed the amount of allowable resources.  Select another file."

This error relates to the attachments for the form, not the form itself and it's a forms services configuration problem in Central Admin.

Under SharePoint Central Admin, under Application Management and InfoPath Forms Services Configuration, there is a setting for "Form Session State" and the default size is 4 MB.  Its used to store transient data that exists when a form is being filled in.

That default size impacts the upload capability of any infopath form with attachments - so increase it but don't go silly as on a busy site with lots of attachments, lots of forms and other document libraries being subjected to upload it may impact your SQL and memory resources if you don't have the the session state serfvice or forms viewstate service correctly setup .

If you are going to change this setting - read this Technet article first.
http://technet2.microsoft.com/Office/en-us/library/3c4e8fb1-c3ce-4d27-8c65-6c4ab140f7051033.mspx?mfr=true

It's also a useful pointer for anyone who's forms data is simply not being accepted or dissapearing on submission.