I have a Motorola Moto G with an Android OS and I've had this issue for a long while now. It's quite an old phone with 8GB storage but I don't really need a lot of storage for my needs right now, so that's fine. However, I've realised that the amount of storage I have keeps going down all the time when I haven't updated any applications or downloaded anything. This leads to me running out of storage constantly which is causing issues because it means I have to keep deleting applications which all used to fit on my phone fine.
I'm not asking for a solution, but I'd like possible explanations for what's happening with my storage and where it could all be going.