Using storage card as internal storage

Is this really possible?

How to use micro SD card as internal storage in Android Marshmallow? - Android Guides

I've run out of internal space so often is getting to be a real pain. Whenever there's a lot of updates, there's rarely enough space so I have to delete apps and reinstall if needed.

But this article seems to say you CAN use an external...

Using storage card as internal storage

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