LG LGL45C - Manual (Page 250)

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The microSD card can only be mounted for use by either the
device or a connected computer. Prior to accessing the card
via a different method, it must first be unmounted from its
current device (phone or computer USB).
Important: The microSD card can only share a connection with one
device at a time, either your device or your computer (via its USB
connection); not both. You cannot browse the contents of the card
via your device if they are currently being browsed via your computer.
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