Storage issue

Hi justine_ms,

The resource below provides some information about the data marked as "Other"on your iPhone:

Check your storage on your iPhone, iPad, and iPod touch

Here is a list of the types of content on your iOS device, and what each type includes:

• Audio: Songs, audio podcasts, audiobooks, voice memos, and ringtones
• Video: Movies, music videos, and TV shows
• Photos: Camera Roll content, Photo Stream, and Photo Library
• Apps: Installed apps
• Books: iBooks books and PDF files
• Documents & Data: Safari Offline Reading List, files created within apps, and app content like contacts, calendars, messages, and emails (and their attachments)
• Other: Settings, Siri voices, system data, and cached files

More about cached files in "Other" iOS storage

Cached files are created when streaming or viewing content like music, videos, and photos. When you stream music or video, that content is stored as cached files on your iOS device. iTunes categorizes cached music, videos, and photos as Other instead of actual songs, videos, or photos.

Take care,

Do you have any Idea on how to delete those cache files?

The article below explains what is stored in the Other cache. If your Other is 20 GB, your system is likely corrupted as typical values are in the order of 300 - 500 MBs and usually no more than 1 GB. To "clean" your Other you need to do a Restore. First backup your iPhone using iTunes on your computer and then Restore the backup.

http://osxdaily.com/2013/07/24/remove-other-data-storage-iphone-ipad/

https://support.apple.com/en-us/HT201252