[AngularJS] How to use ui-sref="preview({ preview: file.dropbox_name,extension:file.type })" to work more efficiently on First click

[beastar 457]

I have a problem that on first click the link is supposed to open a preview 
of my file as you see the link, but it is working only when I click on 
second time first of all on first click url changes but it is not taking me 
there.
here are my javascript for it


.state('/Files', {
          url: "/Files",
          templateUrl: '/App/scripts/files.html'

        })

        .state('preview', {
            url: '/Files?preview?extension',
            templateUrl: '/App/scripts/views/filePreview.html',
            controller : 'FilesController'
          })


can anyone suggest me a good way I can solve this issue?

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