We know that there are tools to take full page screenshots of websites. But have you thought of a full conversation screenshots of WhatsApp? Like full page screenshots of websites we can take full conversation screenshots of WhatsApp.
There is an app called Stitch & Share with which we can take scrolling screenshots of WhatsApp conversations. It is not only useful for only WhatsApp, you can use it on any chat app like Facebook Messenger, Telegram Messenger, Viber, Google Allo, etc.
Some phones like Huawei and Samsung usually have this kind of apps for taking scrolling screenshots or long screenshots. However not all phones have these apps in such case this app is helpful.