The Redmi Note 14S supports MP4, MKV, WEBM, and 3GP.
For your reference, here's more information about these formats:
1. MP4 is a widely-used video format that supports high-quality video and audio compression, making it ideal for streaming and playback on multiple devices;
2. MKV (Matroska Video) is a flexible container format that can hold various video, audio, and subtitle tracks, often used for high-definition videos;
3. WEBM is a format designed for web use, offering high-quality video compression with open-source support;
4. 3GP is a format designed for mobile devices, especially for lower file sizes and compatibility with older phones.