dist/flow.js
function () {
      var uploading = false;
      each(this.files, function (file) {
        if (file.isUploading()) {
          uploading = true;
          return false;
        }
      });
      return uploading;
    }
function () {
      var uploading = false;
      each(this.files, function (file) {
        if (file.isUploading()) {
          uploading = true;
          return false;
        }
      });
      return uploading;
    }
Returns a boolean indicating whether or not the instance is currently
uploading anything.
@function
@returns {boolean}