Issue with evidence fields of test run

[Neeraj_Shrivastava]

Hi All,

           I have installed the X-RAY 3.6.4 and using as a local server. I am using the trial version . I am getting difficulty to attach text file with evidence field of test run . I am following the below link

https://confluence.xpand-it.com/display/XRAY23/Test+Runs+-+REST#TestRunsREST-TestRun

Command:

curl -H "Content-Type: application/json" -X PUT -u admin:admin --data @@mydatarun.json http://localhost:8060/rest/raven/1.0/api/testrun/{id

content of "mydatarun.json" file

{
"status": "FAIL",
"comment": "new comment",
"evidences": {
"add": [{
"filename": "example.txt",
"contentType": "plain/text",
"data": "(base64 encoding...)"
}, {
"filename": "example2.txt",
"contentType": "plain/text",
"data": "(base64 encoding...)"
}]
}
}

Commands executed but uploaded file size is 0 although names are correct 

Evidence:

example.txt : 0kb

example1.txt : 0kb

I know this could be basic issue but I am evaluating the product for my company . Please help .