Action Details
Requirements and how-to articles for Twitter's action:

paid action
A tweet with a single image or an animated GIF which shows up in users' feeds.

You need this to get it done:

File format: .jpg/.png/.gif (.bmp/.tiff not supported)
Maximum file size: 3MB
Aspect ratio: 16:9 (mobile) 2:1 to 1:1 (desktop)
Minimum image width: 600 pixels
Tweet Text
Text to accompany the image/GIF (maximum of 280 characters.)
The URL you would like to send your audience to.
Requirements missing or found errors? Report

How-To Articles
A list of useful links for you:

Twitter Business - Advertiser creative specifications
Official information on creative specs for ads.
Link missing here or found errors? Improve How-Tos