To scan your phone for old and unused items to remove, like downloads and unused apps:
Touch Clean.
You’ll see suggestions for categories of items to check and free up space.
If you don't see suggestions to free up space, check that suggestions are on:
To free up space:
Do any of the following:
If you automatically back up your photos and videos, you can automatically remove copies from your phone's internal storage after 30, 60, or 90 days.
If you store photos or videos on your SD card, this does not delete them.