Why doesn't Android File Transfer recognize my SD Card?

A

AC Question

I have a Samsung Galaxy S7, and I often transfer music from my Mac to my S7. The Android File Transfer usually works when I connect my phone via USB cable in order to get to my SD card to transfer music on to there instead of my internal storage. However, sometimes AFT doesn't want to "open up" my SD card and gives me those window pop-ups with "Not Connected" or "Unlock your phone" kind of messages. I am able to connect to the internal storage (only after a few connection issues), but every time I click on "Card" in the AFT window, it almost automatically shows a pop-up of the messages I mentioned above.

The weird thing is that this only occurs randomly. Such as yesterday and a couple of days before, I was able to transfer music files from my Mac to S7 using AFT, but today I cannot.

I also do not want to remove the SD card because the last time I did, my computer showed that nothing was on my SD card (even though my phone showed that there was), and my playlists kept being deleted.

If anyone has a solution, please let me know.

Thank you!
 

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