if you are using 1.6.x, you can have a look here :
http://www.question2answer.org/qa/24390/tips-upload-file-management-with-v1-6?show=24390#q24390
Welcome to the Q&A site for Question2Answer.
If you have a question about Q2A, please ask here, in English.
To report a bug, please create a new issue on Github or ask a question here with the bug tag.
If you just want to try Q2A, please use the demo site.