By windows they are listed as 1kb with their 'type' being ''TXT_abcdef_File'' where abcdef is a four to seven digit number.
The PATH to them on the phone is Android/data/dji.go.v5/files/FlightRecord/si_cache.
It appears that some of these files have a corresponding ''DJIFlightRecord_yyyy-mm-dd_[hh-mm-ss].txt '' file of what might be normal .txt flight log size but others do not.
It may be that I have moved the 'missing' 'corresponding' files off the phone.

Hi, Captain. Thanks for reaching out. Do you have a screenshot or picture of the specific file? We'd like to forward them to our related team for confirmation. Thank you.

Whoops didnt quote the person to whom I am responding

DJI Tony Posted at 3-20 23:40
Hi, Captain. Thanks for reaching out. Do you have a screenshot or picture of the specific file? We'd like to forward them to our related team for confirmation. Thank you.

DJI Tony, see the above post

Sean-bumble-bee Posted at 3-21 02:13
DJI Tony, see the above post

Thanks, Captain. We have forwarded it for confirmation. Thank you.

Sean-bumble-bee Posted at 3-21 02:11
Whoops didnt quote the person to whom I am responding

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Hi, Captain. We just received feedback from our engineers. The information are regretfully internal technical information that cannot be shared. We're sorry for the inconvenience. It has been confirmed that it will not have an impact on users' usage. Thanks for your understanding.