DJI Pocket saves on mobile phones not in 4k but only in 1080p.
When the SD card is full, the Pocket will save the file to the phone when the phone is docked.
But unfortunately not in 4k but only in 1080p.

In Edius this file can not be imported. I don't no why.

DJI support please change this!

Also save on mobile in 4k in the same format.

Most phones record in 4k but can't import 4k. The same goes for tablet

They will only import 1080p and in some cases 720p

Iphone 7 plus.  Can't save with mimo app but can load them from a wifi hard drive?  This is a slow and tedious way to transfer files.  So it seems to be on DJI and the mimo app failing to transfer the files.  Disappointed DJI.

I also noticed it.  My OP didnt have an SD inserted and the video was saved to my iphone.  One thing to consider, from my findings it only saves at 30 fps 1080, but also at a very low video bitrate.  My videos were around 15 mbps which is more than enough for social media I guess, but for everything else I would use a higher bitrate.  It is still awesome the OP can capture without an sd.