Screen/video recording takes up a lot of intenal data storage space
One minute of 720p video costs 60 MBs of internal data storage space.
One minute of 1080p recorded video takes 130 MBs of internsl data storage space.
An hour video at 720p takes up over 3.5 GBs.
An hour of 1080p video takes up nearly 8 Gbs.
While video is recording, it is actually temporarily taking up double this amount of storage space as it is save into a buffer before saving the single video file.
So, this goes to 7 GBs for an hour long 720p video and 16 GBs for an hour ling 1080p video, respectively.
If your iPad does not have sufficient intenal storage space to screen record a long recording, then the recording will prematurely end and will not save.
That screen recording is gone, never happened.
Sorry.
Before doing any long screen/video recording, it is necessary to make sure your iOS device has sufficient internal device storage to do so.
Otherwise recording will stop and will NOT save and you lose the recording.
Sorry,
Something new for you to learn about your iPad and video recording.