app-fileservices problems

Hi all.  I'm trying to use app-fileservices, but I can't get the default 
model=file.upload to do its thing.  I browse to the file, click upload, 
but nothing gets uploaded.

I'm using struts client, tomcat, and latest from CVS, j2sdk1.5.0_03.

anyone using this successfully?  I've looked at the code, and examined 
log files.  I don't understand the logic in FileUploadModel.java that 
tries to get a file name from a parameter that starts with 
"_file_data_".  I don't see where that param gets set either.  Maybe if 
someone could point that out to me, I could get past this.

TIA,
gene