The same request works on Fiddler. so the web service is working ok.
When creating http request on Jmeter with same parameters as in fiddler, I get the correct response from server but the file does not appears in site. It's a simple http post request with zip file.
I have attached the file in "Files upload" in Jmeter with MIME type the same as in Fiddler (application/x-zip-compressed), etc... but the file get not uploaded while posting from Jmeter.
I dont know what other information you may need, just ask for it and I will try to find it.
this is how the request looks on Fiddler:
when recording with Jmeter the http request look like the picture: