3d printer doesn't read as card

Whenever I put my ad card into my Kossl pully the test files won't show up I see them on my computer but not on the printer what do I do

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Probably going to need to google this.

Is this a new issue or it has always been this way?

Some basics are this: no folders on the card.  Short file names with no spaces or special characters.

Try a few different cards.

If nothing works then it is possible the reader is bad or maybe turned off in the firmware.

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