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

Requirements
You need this to get it done:

Title
The title of your post. You can also add a subtitle if you wish.
Tags
Add up to 5 tags so readers know what your post is about.
Image
Add an image to your post to help catch your reader's attention.
File format: .jpg/.jpeg/.png/.gif
Maximum file size: 25MB
Recommended size: 1400 pixels for full column-width images, 2040 pixels for out-set images and 2500 pixels for screen-width images. (Image needs to be at least 1060 pixels wide for all four placement options to be available.)
You can also add a caption to your image if you wish.
Body Text
The body of your post.
Available formatting:
Bold
Italics
Link
Header
Subheader
Quote
Superscript (only for numbers)
@mentions
Lists (both bulleted and numbered)
Emoji are supported.
You can also add private notes which only you can see.
Requirements missing or found errors? Report

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

0
Medium Help Center - Write a post
Official guide for writing posts on Medium.
Official
Link missing here or found errors? Improve How-Tos