ThreadMeApp lets you easily create and post Twitter threads, with up to 4 image, videos or GIFs for each message. If theres an error when posting, it can automatically delete the messages that were successfully posted or it can leave them for you to manually examine and delete if needed.
Thats pretty much it! Enter your text, then go to the Post Editor where you can see all the Tweets that will post, move the text around and add images and videos. Tap the Post to send it Twitter.