Offline methods are also faster in many cases ... Bluetooth provides a direct way to transfer files between Android devices without Wi-Fi. It uses 2.4GHz radio waves for one-to-one file sharing.

(1) A file in a storage device that is not attached to a computer. In the past, an offline file may have referred to files on magnetic tapes or removable disk drives. See removable disk ...

However, if it's important to you that you can easily access your files offline, then keeping them ... The caveat of this ...