Adoptable storage is important because, by default, Android doesn’t support installation of apps directly to the external storage. As a result, anything you download must go to the internal storage before it can be moved to the SD card. On devices with low internal storage, this can pose a problem as such devices might not have the space required for the initial install of an app on the internal storage. Adoptable storage fixes this by treating the external storage as part of the internal space, and it’s a feature that’s a boon on low-end smartphones and something nice to have on mid-range and high-end phones.
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