You need this to get it done:
Action DetailsRequirements and how-to articles for TikTok's action:
A short caption for your challenge video. Be sure to include the hashtag for your challenge.
The hashtag for users to tag their challenge entry videos with.
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.
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
Audio for users to use in their challenge entry videos.