Thank you for your reply
I was using auto setting since it was my first time flying
Samsung EVO plus 64GB Micro SD Card
I see it in the original footage as well.
It's probably your micro SD card because the Samsung EVO Plus only has a minimum sustained write speed of 10MB/s and 100Mbps 4K video requires 12.5MB/s in order to write properly and not drop frames. Pay no attention to the names of the cards like "Extreme" or "Pro" and whatnot - it means absolutely nothing and manufacturers are putting those same names on many different grades of cards. The maximum theoretical transfer speeds they advertise on the cards like "Up to 100MB/s" also mean nothing for these purposes. Ignore all that. The only thing you need to look for is a "U3" or "V30" symbol indicating that the
minimum sustained write speed is 30MB/s which is more than enough to cover you off. And stick to name-brand cards (Sandisk, Lexar, Samsung, Sony, etc.)
Second, learn to use Manual mode as AUTO is going to give you really uneven footage as it constantly tries to adjust the shutter speed and ISO to even out your exposure. You mention it's your first time flying so don't be discouraged at all - I think everything you saw that you didn't like in your video will be resolved by doing the two things I mentioned above.
See my more detailed explanation of memory cards and how they interact with the
Mavic Air here:
Tips for New Flyers