Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can easily download Animated Flags +Mobile Free.
Animated Flags Mobile v1.0.3
Animated Flags Mobile v1.0
Animated Flags is simple, easy to use and very CPU friendly. All the animations are stored as meshes. No CPU heavy cloth or skin simulation.
Mobile optimized prefabs, materials and shaders.
✓ Drag & Drop Animated Flag Prefabs
✓ Mesh Animation, no cloth or skin
✓ 704 and 280 tris models
✓ Many variations of animations
✓ 1x Pirate Flag
✓ 7x Example Flags
✓ 1024x1024px texture and normal
✓ Easy to add new textures
Easily customize the flag with a custom texture by simply replacing the material.
Compatible with Unity 5.1 up to new versions of Unity(2020+)
Support available for assistance if any problems should occur.