Hello, I am 54 years old and new to Smartphones. I have a Samsung galaxy express 3, and based on other reports, I have used too much internal storage. I got an external memory card ( 64 GB ). I am not sure I have moved, deleted, saved anything from my phone. My internal storage is about maxed out 7.49 of 8.0. From what I can see the other file is full. What is "other file" ? Do I need to go to the AT&T Store and get them to help me. I am so confused.