Samsung
Turn Dynamic Lock Screen On or Off auf Samsung
Samsung's lock screen supports two different ways to show a changing background. You can pick photos manually from your own gallery, or let a wallpaper service such as Dynamic Lock Screen or Samsung Global Goals rotate images automatically.
When Dynamic Lock Screen is active, it replaces your manually selected wallpaper with a stream of curated photos that change on a schedule. This can look like your custom picture disappeared, even though it is only hidden behind the active service.
To switch the feature on or off, open Settings ➔ Lock screen ➔ Wallpaper services. Choose Dynamic Lock screen to enable automatic rotation, or select None to disable it and return to a static or gallery-based wallpaper. Confirm with Apply.
Disabling Dynamic Lock Screen also stops the background downloads the service uses to fetch new images, which can save mobile data if wallpapers were updating over a cellular connection. Turn it back on whenever you want a screen that refreshes itself without picking new photos manually.