Fix Magento 2.0 Video Upload Issue

I need help resolving a video upload issue on my Magento 2.0 site using the Webkul extension. The upload function is unresponsive for MP4.

Basically when click save, nothing happens.
PHP setting have been changed accordingly.

Requirements:
- Diagnose and fix the unresponsive upload issue for specific video formats (MP4).
- Ensure the Webkul extension functions correctly post-fix.
- Test with various formats to confirm resolution.

Ideal Skills:
- Expertise in Magento 2.0
- Experience with Webkul extensions
- Strong troubleshooting skills for video upload issues
- Familiarity with MP4 and other video formats