[Plasar]

• I've been struggling for the longest time to get a single MP3 to play from a 128 GB SD card stuck in a USB adapter.
• Of course, first step was to go to the 2017 Camaro owners manual - which specifically says FAT16, FAT32, exFAT are supported, and other disk formats, specifically NTFS are NOT SUPPORTED.
• I tried another 16 GB USB thumb drive with exFAT - no go.
• Now after Googling yesterday and finding a poster who said that their USB storage device worked with NTFS, I formatted my SD to NTFS and... bang, it works fine - at least for my sample 13 x MP3 songs.
• Now I'm dumping my 90GB iTunes libarary to MP3 highest quality - I'll see how much fits on my 128 GB SD card, and the Camaro manual says there is a 5,000 song limit.
• Wish me luck!

2017 Camaro manual, pg 172 (also on pg 171):

Using USB Storage Devices and
iPod/iPhone:

* Only USB storage devices
formatted in FAT16/32 or exFAT
file systems are recognized.
NTFS and other file systems are
not recognized.

[Plasar]

Wish I saw this thread first:

USB formatted to NTFS works...

[Plasar]

* It turned out to be 39 GB of 320K MP3 files.
* This is because none of my "downloaded" iTunes albums/songs could be dumped to MP3. iTunes only converted the items I loaded from CD into my local Mac iTunes library.
* There are several apps out there that are supposed to allow you to rip even the downloaded iTunes music to MP3 - but the one I saw was $40.
* Good news - for the 39 GB of music, it seems to play fine in my ZL1.