Dropbox Chooser onClick Function

let options = 
{
        // Required. Called when a user selects an item in the Chooser.
        success: async files => {
          console.log(files);
        },
        // Optional. Called when the user closes the dialog without selecting a file
        // and does not include any parameters.
        cancel: function() {},
        linkType: "preview",
        extensions: [
          ".pdf",
          ".doc",
        ],
        folderselect: false, // or true
        sizeLimit: 102400000 // or any positive number
      };
      Dropbox.choose(options);
 }