code: def save_and_validate_logo(logo_stream, logo_filename, community_id):
      
      cfg = current_app.config
  
      logos_bucket_id = cfg['COMMUNITIES_BUCKET_UUID']
      logo_max_size = cfg['COMMUNITIES_LOGO_MAX_SIZE']
      logos_bucket = Bucket.query.get(logos_bucket_id)
      ext = os.path.splitext(logo_filename)[1]
      ext = ext[1:] if ext.startswith('.') else ext
  
      logo_stream.seek(SEEK_SET, SEEK_END)  # Seek from beginning to end
      logo_size = logo_stream.tell()
      if logo_size > logo_max_size:
          return None
  
      if ext in cfg['COMMUNITIES_LOGO_EXTENSIONS']:
          key = "{0}/logo.{1}".format(community_id, ext)
          logo_stream.seek(0)  # Rewind the stream to the beginning
          ObjectVersion.create(logos_bucket, key, stream=logo_stream,
                               size=logo_size)
          return ext
      else:
          return None
docs: Validate if communities logo is in limit size and save it.