Can't Access Internal Storage

So I have a couple of Pi Zeros running the latest version of Volumio. I’m storing my music files on internal high endurance SD Cards on the Pi’s.

I’m running a MacBook to access the Pi’s.

I read about how the cards can be accessed via the Finder as “Internal” drives and that worked fine for uploading some new music files today.

When I try to access them now, I’m getting an error message via the Finder stating that, "The operation can’t be completed because the original item for “Internal Storage” can’t be found.

I’m guessing that some how, the unix permissions changed on the SD cards permission but I’m not enough of a Linux geek to know how to change this, (and particularly since we’re working with a stripped down version of Linux at that.

Any thoughts how to fix this?

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