I was trying to use https://github.com/blueimp/jQuery-File-Upload/wiki/Multiple-File-Input-Fields-in-One-Form for multiple file fields but I could make it work for multiple file fields and when the files will be saved in one db row.
According to the documentation of the above link, it creates separate submit(start) button for each file. I want a common start button for all the file fields with a preview of each of the files and they will be submitted with a single request.