How to add transition effects to a video on TikTok using in-app tools

You can do transitions on TikTok using the app's on-board editing function to add effects, or download third-party apps that are compatible.

How to combine videos on your Samsung Galaxy S10 and add or edit transition effects

You can combine videos on a Samsung Galaxy S10, along with other media like images, to create a new, edited video using the built-in Gallery app.