Generally when we want to save a tweet we choose to make a screen print. Now there is another resource that helps you capture that screen with a simple comment.
It is only necessary to access the chosen tweet and comment on it mentioning the account @get_screenshot and at the moment you will have the image via DM.
This is a bot that without human intervention will make the screen print and send it to you automatically.
The best thing is to follow the account so that the capture enters you directly; If you forget this step, you will surely receive a message like: "Someone you do not follow wants to send you a message", just by accepting it you will have it saved in your personal cloud.