When you do this, the Android File Transfer app will either automatically start (which it does on my Mac), or you can go ahead and start it manually, at which point you’ll see the Android File Transfer main window: As of March, 2017, it is now labeled “Transfer files,” with the subtitle, “Transfer files to another device.” Note that this option has changed names at least once. On this dialog you want to tap the “Transfer files (MTP)” option, as indicated by that large red arrow. Tapping that notification brings up the following dialog: The solution to the problem on Android 7, Android 6 (and maybe Android 5) is to unlock your Android device (if it isn’t unlocked already), pull down the list of notifications, then tap the “USB for charging” notification: Unfortunately that’s a misleading and unhelpful error message, as the problem has nothing to do with the Android device screen being locked. This is what the Mac error message dialog looks like: If your device’s screen is locked, disconnect its USB cable, unlock your screen, and then reconnect the USB cable. After I connected my Nexus 9 tablet to the Mac with its USB cable and then started the Android File Transfer app, I saw this error message on my Mac:Ĭan’t access device storage. Last night I was trying to use the Android File Transfer program on my MacOS system to transfer music to my Google Nexus 9, which now runs Android 6 Android 7. Android/macOS Solution: This article shows a solution to the Android File Transfer app “not working on Mac” problem, where you get the Android error message, “Can’t access storage device.” (This solution may also work on Microsoft Windows systems, though I don’t have a Windows system to test with to know for sure.)

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