The internal memory of your smartphone or SD card is insufficient. In the first case, you can convert your SD card into an internal memory source – as we will show you below.

If your Android phone is running out of storage space, many phones will allow you to insert an SD card, which you can set as the phone's primary storage.

When you use a microSD card as internal storage, the phone formats the card in a way ... It’s slightly easier to transfer files to your Android phone and the SD card on that phone with a PC, simply ...

Using An SD Card As Internal Storage Added with Android Marshmallow, Android supports changing how the phone uses an inserted SD card from external storage to an effective extension of internal ...

Besides saving internal memory, if the tablet should fail (as her old one did after 5 years heavy use) we want to recover the photos/folders from the SD card. "Adopting" the card would prevent that.