How to upgrade Samsung Galaxy Tab A6 to Android 6 or higher

[Android Central Question]

I have Samsung Galaxy Tab A6 model number SM-T280 running Android 5.1.1.
The memory is only 8GB so I bought a micro SD card but because it's running an old version of Android, I can't incorporate the SD card memory into the tablet's memory. Hardly any of the apps can be moved onto the SD card and I don't have a lot of photos or music to move.
If I can upgrade to Android 6 (Marshmallow) I understand that I will be able to do what I want. Is this right, and if so, How do I do it?

 

[hallux]

If I can upgrade to Android 6

Officially, you can't. Samsung never released any OS for that device other than Lollipop, according to sammobile.com

There's a site - xda-developers.com - that is often suggested as the place to look for 3rd-party options to update devices to versions of Android that were never released for that device. There is a risk in doing this, it should all be explained in the threads there..

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[L0n3N1nja]

Samsung has also never supported adoptable storage, it's very likely any newer ROM based on their software that someone has made won't support it either.