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

To engage your audience, start a challenge for TikTok users to participate in.

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.
Challenge Video
Upload a video demonstrating your challenge and using your challenge audio.
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
Challenge Audio
Audio for users to use in their challenge entry videos.
Video Caption
A short caption for your challenge video. Be sure to include the hashtag for your challenge.
Challenge Hashtag
The hashtag for users to tag their challenge entry videos with.
Requirements missing or found errors? Report

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

Fanbytes - How To Go Viral on TikTok with Influencers
Article describing how to grab your audience's attention on TikTok using challenges and hashtags.
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