Animated Message Envelope Icon with Liquid Fill Effect

This minimalist animated icon features a sleek black outline of an envelope, designed to convey messages or email notifications. Inside the envelope, a dynamic white wave animates with a fluid, up-and-down motion, simulating a filling or loading state. A small, solid oval indicator is positioned at the bottom left, adding to its functional design. The clean lines and flat design aesthetic make this loopable animation highly versatile for various digital applications. It serves as an excellent visual cue for user interfaces, mobile apps, website notifications, or any project requiring a clear and modern representation of communication or process status with a smooth, engaging effect.