I've done some filming and when I return and remove Msd card from Mavic to Goggles I cannot playback.
I am using Sandisk 64G UHS 3
The only way to playback recorded video without starting up Mavic is to create a Thumbnail and place it in DJI's subfolder. So that I can select it in playback.
I hope this it just a bug and they can fix it.
Otherwise it dosent show a thumbnail to select.
Otherwise fantastik technology!

They only work with 16 g. Cards. I tray 64,36. They dont. Only 16. And i can only format the 16 in the goggles.

I too had the same problem and after a lot of different tries including contacting DJI, finally I managed to sort it out; the problem is the goggles doesn't read sd card's exFAT format, so I downloaded freeware ver of "Easeus Partition Master" and converted the format of sd card from exFAT to FAT32 and set it as "PRIMARY"(this is very important", now everything working fine. Please let me know if you have any questions.