code: public function write(string $content, bool $append = false, int $mode = LOCK_EX): self
      {
          $this->checkFileWritePermissions();
  
          if (!$this->storage->writeFile($content, $append, $mode)) {
              throw new AccessDeniedException('unable to write file-content', 403);
          }
  
          return $this;
      }
docs: write content to storage
  @param  string $content
  @param bool $append
  @param int $mode LOCK_EX
  @return self
  @throws AccessDeniedException