In possibly my most audience-specific post ever, note that there may be some compatibility issues between Garmin’s latest action camera (the Ultra 30) and the 64GB Samsung Evo micro SD card.
I’ve tested two of those cards without success, whereas a Samsung 32GB and a Sandisk Ultra 64GB work without problems. There was also at least one other person on the DC Rainmaker post for the camera reporting similarly issues. It’ll still record, but won’t import into the Virb Edit desktop application. If you try it’ll fail, then give you a bunch of card errors.
Something to bear in mind (for example, if you acquired an Ultra 30 following your Go Pro silver internal mic mysteriously dying whilst still under warranty).