You need this to get it done:
Action DetailsRequirements and how-to articles for TikTok's action:
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.)