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I was using QNEthernet to connect the doorbell to my HomeAssistant server so I can get notifications forwarded to my phone. The printf was a bonus. I guess I should check the SD.open() call's return status. I had assumed that if the SD.begin() worked, the root directory would be available.

I am experiencing an odd issue after upgrading to Arduino IDE 2.04 (from 2.03) and Teensyduino 1.58 and I can't seem to figure it out. I'm running on a Teensy 4.1 with ethernet. Some background: I've made a programmable doorbell that plays custom WAV files for the bell tones (among other...