1)If your Mac shows Gitfos GFLP801/AM-243-BT States "Offline" or not display in“Printers&Scanners”, it means that Mac did not recognize the printer.
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Please try to unplug and plug the USB cable the Mac computer side and the printer side.
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Then restart the printer(power off then on).
2)If it is still not displayed in “Printers&Scanners”, we need to check the USB connection.
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Connect the flash drive by using the USB adapter and check whether the computer can read the data.
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Unplug the flash drive and replace it with the USB cable of the printer. normally, if the flash drive can be read on the Mac, that USB adapter can provide a stable data connection for the printer.
3)If it is still not displayed in “Printers&Scanners”, please contact our after-sales service.