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

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.
Choose from TikTok's music library, or record your own audio.
You can choose a filter to add to your video before posting.
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
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.)
Link missing here or found errors? Improve How-Tos