MATLAB: Adding attachment to Jira with Matlab RESTful API

httpMATLABrestful

I'm trying to add attachment to Jira issue from Matlab. The code below returns HTTP Status 200 OK, but the file is not added to the Jira issue. What is the reason for that?
import matlab.net.http.io.MultipartProvider
import matlab.net.http.io.FileProvider
import matlab.net.http.io.MultipartFormProvider
HeaderField = matlab.net.http.HeaderField('Authorization','Basic USERNAME:PASSWORD', 'Content-Type','multipart/form-data', 'X-Atlassian-Token','no-check');
fps = FileProvider("myfile.txt");
mp = MultipartProvider(fps);
formProvider = MultipartFormProvider("files",mp);
req = matlab.net.http.RequestMessage('post',HeaderField,formProvider)
req.send('https://XXX.atlassian.net/rest/api/2/issue/TEST-1/attachments')
I can add the attachment from windows command prompt using code (as instructed here: Atlassian document):
curl -D- -u USERNAME:PASSWORD -X POST -H "X-Atlassian-Token: no-check" -F "file=@myfile.txt" https://XXX.atlassian.net/rest/api/2/issue/TEST-1/attachments

Best Answer

Juho - since the CURL statement works, why not build that in MATLAB and use system to execute that statement?
userName = 'myUserName';
password = 'myPassword';
fileName = 'myfile.txt';
curlCommand = sprintf('curl -D- -u %s:%s -X POST -H "X-Atlassian-Token: no-check" -F "file=@%s" https://XXX.atlassian.net/rest/api/2/issue/TEST-1/attachments', ...
    userName, password, fileName);
[status, cmdout] = system(curlCommand);
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