You potentially have many issues
* Does your file path match to the file location from the location
from which you are executing the virtual user. If not then here is
your issue
* Are many users trying to upload the same file? If so then you can
run into one of two issues
--Lock contention on the file preventing user B from getting access
once user A has an exclusive lock on the file
--A uniqueness constraint on the filename/content/size. You may have
to create new, unique files on the fly for upload. IF you need to do
this consider the use of a RAM drive for the actual creation and
management of the files. Be sure and delete the file at the end of
each iteration as well.
* Do you have a unique ID that is associated with your file upload.
IF so, you will need to address this in the appropriate fashion for
your file to upload
James Pulley,
http://www.loadrunnerbythehour.com/PricingMatrix