Wechat service number, send graphic messages. Is there a word limit for this picture information? If so, what are the restrictions?

Officially, the number of titles can't exceed 64, but because of the display problem of mobile phone, it's best not to exceed 15 words for the first one, otherwise all of them can't be displayed. The following article doesn't matter, but don't be too long. It's too long for anyone to understand. There was a saying before that it was limited to 20 thousand words, and I haven't encountered any hint of exceeding the number of words. Hope to adopt ~