How to overwrite upload file

Hi all,

I have an issue as below: 

I upload a file from local to jasperserver as "abc.pdf ". Then I upload again this file to jasperserver as before name "abc.pdf". But on server create a second file is "abc_1.pdf"

So that. have any ways to overwrite abc.pdf when I upload again?

Reference: http://community.jaspersoft.com/documentation/jasperreports-server-web-services-guide/v56/uploading-file-resources

Thanks.