A major iOS software update normally requires a couple of gigabytes of storage space. If you don’t have room on your iPhone or iPad to install an update, follow these steps to quickly free some up.
Delete Photos and Videos
If your iPhone or iPad is packed with photos and videos, it’s unlikely all of them are worth keeping. For every Instagram-worthy shot, you probably have 5 to 10 you can do without. Once you delete those photos, you quickly recover storage space.
Open the Photos app, navigate to the “Recents” album, and then tap “Select.”
Scroll through all your photos and select the ones you can delete. When they’re all selected, tap the Delete button in the bottom-right corner.
In the next popup, tap “Delete Photos” (this also deletes the photos from your iCloud account).
But iOS and iPadOS won’t delete the photos immediately. Go to the “Albums” tab and select the “Recently Deleted” album. Here, tap “Select,” and then tap “Delete All” to get rid of all your deleted photos.
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Source : How to Create More Space for an iPhone or iPad Update
