I have tried both methods. Formatting in my PC causes no problems. Formatting in the DJI Mini 3 Pro makes the memory cards I have tried a READ ONCE THEN SELF DESTRUCT device once they are placed in the PC's card reader. Meaning you can plug the card back into the drone, and it will act like it is writing your videos just fine to that card. But when you take the card back to the PC to download those videos you just took, well good luck with that.When you format the micro SD: do you format it while it's plugged in to the PC? or do you format the card after you have re-inserted it into the drone? I have come across mentions of card read errors as a result of formatting the card on a PC and then inserting it into the drone. I always port my shots from the SD card to PC with it plugged into an adapter, but I then crank the drone up and format the micro SD using the camera tab in the FLY app and I format the card every time I boot the drone up for the next flight. So far: touch wood: no problems with the 64gig Sandisk in over three years.
Formatting via the PC, however, I can swap the cards back and forth, without any problems at all. The point of this is to try to determine if my example of the Mini 3 Pro has a problem formatting the memory cards. I posted a short and very simple test that someone (anyone?) could try to help me isolate the problem.