The “Other” storage, which actually saves app related data (mostly). If you want to clear the “Other” storage, you need to check which app take up large storage and then clear the app files, app caches, app temp files. To check the apps, open Settings =>General =>Storage, and scroll down to find the details. Or you can delete the app directly and reinstall it.
If you don’t want to bother to clear the app files one by one, you can use a professional iOS device eraser tool. The one I recommend is iOS data eraser.
Step 1: Connect Your iPhone to Computer
To start with, run the program and connect your iPhone to your computer via an USB cable. When your devices are connected and recognized by your program, your devices will show in the window as follow.
Step 2: Scan Your iOS Device
You can simply click on Quick Scan to do a full scan of your device, or you can click on each option including Junk files, Temp Files, Camera Roll, Photo Library, Large Files and Apps to scan.
Step 3: Start to Clear the Data
After a while, Syncios will finish scanning your device and list scanning result on the panel. You can choose to clean your desired data to free up space on your device. Of course, you can go Back or do a Rescan.