As far as Google was concerned, Android devices shouldn’t really have microSD card slots, as seen in all its Nexus smartphones and tablets. But in Android 6.0 Marshmallow, Google accepted a compromise, officially “adopting” external storage into one unified storage. Ironically, now it seems that two of the biggest Android OEMs, who have mostly been sporting such memory expansions, are saying “no” to this feature, with both the Samsung Galaxy S7and the LG G5 not allowing users to use microSD card slots for internal storage.
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https://www.slashgear.com/samsung-galaxy-s7-lg-g5-ditch-android-adoptable-storage-24428774/