iPhone 5s internal storage is full
If you are talking about using windows explorer to delete files, that would be of no help. Windows Explorer can ONLY see photos and videos. It treats the phone as a camera and can only see such.

Use iTunes to manage the storage of the device. It will even give you a breakdown of whats using the most on the phone.

Alternatively you can go to Settings -&gt; General -&gt; Usage -&gt; Manage Storage on the phone itself and delete some stuff from there.