First, confirm whether your camera has a time watermark setting feature (basic OSD). If the camera lacks this feature, you can visit the following link to customize and add the feature: https://developer.tuya.com/en/docs/iot/define-product-features?id=K97vug7wgxpoq. Please note that if the device has already been shipped, this method of adding features will not apply. Additionally, you can check the following resources for related solutions: Tuya Support Center: https://docs.tuya.com/en/iot and Tuya Smart Help Center: https://support.tuya.com/en/help