Re: how do I free up internal storage space on my droid ultra version 4
You can open the storage setting and see what is using the most storage. Typically, it'll be apps; however, photos and videos are also often times listed at the top. You can start be deleting unused apps. Next, delete photos and videos (after backing those up) then text messages (that you don't need). Also consider deleting any downloads that you don't need.
Let us know if you have any other questions.