XDA is the holy grail for OnePlus modding. Search for threads like "[OnePlus 11] Collection of Custom Fingerprint Animations."

You cannot directly "download" third-party fingerprint animations and apply them to a standard, non-rooted OnePlus phone. The fingerprint animation is part of the system UI and is not user-replaceable like a wallpaper.

OnePlus OxygenOS allows users to customize the fingerprint unlock animation on devices with in-display fingerprint sensors (OnePlus 6T and newer). These animations trigger when you place your finger on the designated screen area.