Delete old files on your Android phone Another way to free up storage space on your Android phone is to delete old files and documents. You'll find most of these in your phone's Files app.

How to back up data on your old Android phone You'll need to make sure that all the relevant data on your old phone is backed up to the cloud before you make the switch over to your new phone ...

Up to 15GB of free storage is available with Samsung Cloud per Samsung account. There's plenty of space to temporarily store files and backup photos while cleaning your device.