How to make a animated weapon pickup icon

Hi,guys,i am new in modding and want to make a weapon,but i want to make its icon animated and separated the first three frames for the pickup.I worry about that it won't animate,because for the pickup is separated only one frame by default.Can you tell me how to do it.I haven't included the weapon in pk3 file.I attached the first three frames and i want to know will be there a problem if i put them for the spawn stance of the weapon pickup

It's simple: first you'd want to rename your sprites like so: And then, it's just a matter of writing the Spawn state sequence, like this: