@property<EOL><INDENT>def thumbnail(self):<DEDENT>
if self.filetype not in ("<STR_LIT>", "<STR_LIT:image>", "<STR_LIT>"):<EOL><INDENT>raise RuntimeError("<STR_LIT>")<EOL><DEDENT>thumb_srv = self.thumb.get("<STR_LIT>")<EOL>url = f"<STR_LIT>" if thumb_srv else None<EOL>return f"<STR_LIT>" if url else "<STR_LIT>"<EOL>
Returns the thumbnail's url for this image, audio, or video file.
        Returns empty string if the file has no thumbnail