Getting file not submitted error message when tested file upload with JMeter

We are trying to upload file while testing with JMeter and after submit we are getting file not submitted message even though we are uploading. Please note below points:

1. we have kept the file to uploaded in ./bin directory as specified in documentation

2. Parameter name in the request is changing with each call when tried manually from IE (F12). we are seeing the value like GWTU-<random number>

Kindly let us know how to proceed further with this issue.

  Discussion posts and replies are publicly visible