static/js/script.js

// static/js/script.js
document.addEventListener('DOMContentLoaded', () => {
    const form = document.querySelector('form');
    if (form) {
        form.addEventListener('submit', (e) => {
            const fileInput = document.querySelector('input[type="file"]');
            if (!fileInput.files.length) {
                e.preventDefault();
                alert('Please select a video file.');
            }
        });
    }
});