Greetings,
With the latest SoapUI nightly release (3.6-Beta 2, 8/11/2010), I have been able to send sample files of 360MB and 2GB in size, and the files do not need to be cached in the project, which solves my problem.
In case it helps, in the "TestRequest Properties" tab for each test, I had set "Enable MTOM" and "Enable Inline Files" to "true", with all other parameters at their default settings. Also, in the SoapUI Preferences menu item, on the "HTTP Settings" tab, I set the "Chunking Threshold" parameter to "1000000" and the "Scoket Timeout" to "600000" (which was probably much higher than necessary). Otherwise, all other perameters were at the default settings.
Thanks to Ole for the work done to resolve this issue.
Regards,
Scott Calhoun
