For those that haven't looked at their Model 3 Manual, I thought I'd post the Dashcam page with some updated annotated information since some of the basics of TeslaCam don't seem to be understood by everyone.
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I have occasionally noticed that after I've checked my drive on my computer and reinserted it into the USB connector, that the camera icon will show up with a red dot on it but not always. If you don't see the red recording dot or it goes out, tap the camera icon and it should appear if the drive can be written to. No red recording dot, not recording any footage.