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

Post a video on TikTok.

You need this to get it done:

iOS or Android Mobile Device
An iOS or Android device is required in order to be able to use the official TikTok app to record and post videos.
Record a video to post.
Maximum video length: 15 seconds (you can also combine videos together for up to 60 seconds)
Maximum file size: 287.6MB (iOS) 72MB (Android)
Aspect ratio: 9:16
Resolution: 1080 x 1920 pixels
You can choose a filter to add to your video before posting.
Choose from TikTok's music library, or record your own audio.
Add a short caption to your video. You can include hashtags by prefacing a term with the '#' symbol (e.g. a video with #memes will show up for everyone browsing the #memes tag.)
Requirements missing or found errors? Report

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

TikTok Support - Using TikTok
Official information about how to use TikTok (e.g. how to record video, how to add effects/filters, etc.)
Fanbytes - How to Gain Fans on TikTok by Making Your Own Content
Video guide for creating and posting videos on TikTok.
Fanbytes - Beginner's TikTok Marketing For Brands
Information about how to effectively market your brand using TikTok.
Link missing here or found errors? Improve How-Tos