Samsung SM-S766C User Manual page 201

To increase available memory:
Tap Cached data to clear all cached data for all
1.
apps.
2. Tap Miscellaneous files, select unnecessary files
(or tap Select all), and then tap
Memory Card (SD Card)
Once an optional memory card (not included) has been
installed in your device, the card memory displays as
Total space and Available space.
Install a Memory Card
You can use an optional microSD or microSDHC card
(not included) to add additional memory space to your
device.
Settings
189
Delete.
Storage