How do I manage locally stored files on the X10-4K?

Please see: How to manage locally stored files on the projector

How do I connect X10-4K with video streaming capable USB Type-C device?

Please refer to this video.

Why is there Audio Lag with my Bluetooth Speaker, and how to fix it?

Bluetooth latency is caused by signal processing and interference. You can minimize it by adjusting Lip Sync settings, reducing distance, or switching to a wired connection. Optimization Steps: Adjust Sync Settings: Locate the [Audio Delay] or [Lip Sync] option in your playback app (e.g., VLC, YouTube) or source device (e.g., Fire Stick)...

How to connect your mobile device with the X10-4K via Bluetooth?

Please see: How to connect your mobile device with the projector via Bluetooth

How to cast and mirror your mobile device to the X10-4K?

Please see: How to Cast and Mirror your Mobile Device to the Projector