code: protected function convertValuesToPaths()
  	{
  		if (empty($this->varValue))
  		{
  			return;
  		}
  
  		if (!\is_array($this->varValue))
  		{
  			$this->varValue = array($this->varValue);
  		}
  		elseif (empty($this->varValue[0]))
  		{
  			$this->varValue = array();
  		}
  
  		if (empty($this->varValue))
  		{
  			return;
  		}
  
  		// TinyMCE will pass the path instead of the ID
  		if (strpos($this->varValue[0], Config::get('uploadPath') . '/') === 0)
  		{
  			return;
  		}
  
  		// Ignore the numeric IDs when in switch mode (TinyMCE)
  		if (Input::get('switch'))
  		{
  			return;
  		}
  
  		// Return if the custom path is not within the upload path (see #8562)
  		if ($this->path != '' && strpos($this->path, Config::get('uploadPath') . '/') !== 0)
  		{
  			return;
  		}
  
  		$objFiles = FilesModel::findMultipleByIds($this->varValue);
  
  		if ($objFiles !== null)
  		{
  			$this->varValue = array_values($objFiles->fetchEach('path'));
  		}
  	}
docs: Translate the file IDs to file paths