Other storage
How do I reduce the storage taken up by “other”?
iPhone 6s Plus, iOS 13
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Keeping in mind that the “other” storage category is mostly filled with cache and system files created by Safari, the Mail app, other apps and iOS/iPadOS itself, that space is automatically managed by the operating system and you can’t interact with it.
That said, update your device to iOS/iPadOS 13.6.1 or later, as per this support article: Clear Other storage on your iPhone or iPad - Apple Support
If you already updated your device to 13.6.1 or later to no avail, some benefits to reduce that space can be also obtained creating a full backup of your device, then restoring it to factory settings and, in the end, setting it up as new, as per these instructions: Restore your iPhone, iPad, or iPod to factory settings – Apple Support
When done, restore data from your previously made backup, then restart your device and check your device storage again.
If the issue persists, contact Apple Support directly, using this link: Get Support
Regards
Giulio