Shoot in MOV or MP3 / without being split?

[TriBar]

(By MP3 you actually mean MP4 ?)
Have a look at post #3 from @wesbarris in this topic:

Orbit Mission using Waypoints, not Orbit Mode

This is a carryover of the FAT32 file system. FAT32 has a maximum file size of just under 4GB. Even though your card may be formatted using the exFAT file system (which does not have this limit), DJI drones still limit the individual file size to 4GB. In your video editor, if you place the two files one after the other, you should not notice that the footage comes from two separate files. The final footage should look seamless. Of course, if you reduced your video resolution, your entire m…