code: function _bn_getFile(input) {
      // if there is custom file upload logic, for example, images are resized client-side
      // generated Blobs should be assigned to fileInput._file
      // and can be sent via ajax with FormData
  
      // if file was deleted, custom field can be set to an empty string
  
      // Bunny Validation detects if there is custom Blob assigned to file input
      // and uses this file for validation instead of original read-only input.files[]
      if (input._file !== undefined && input._file !== '') {
          if (input._file instanceof Blob === false) {
              console.error("Custom file for input " + input.name + " is not an instance of Blob");
              return false;
          }
          return input._file;
      }
      return input.files[0] || false;
  }
docs: Bunny Validation helper - get file to validate
  @param {HTMLInputElement} input
  @returns {File|Blob|boolean} - If no file uploaded - returns false
  @private