Apple - using iTunes
When flying with an Apple mobile device, you'll need to connect your mobile device to a Mac computer and access the TXT flight log files from iTunes.
If you haven't installed iTunes on your Windows/Mac computer, then download it here and install it.
Start iTunes.
Connect your phone/tablet to your computer via a Lightning/USB cable.
Click the mobile device icon at the top of iTunes to access the contents of your phone/tablet.
If you're using the current version of iTunes, go to File Sharing > DJI GO 4 (or DJI GO) > FlightRecords and click the "Save to" button (you may need to scroll down to find this) to copy that folder to your computer.
On older version of iTunes, you'll need to access the FlightRecords folder from the "Apps" section of iTunes instead.
Open the FlightRecords folder on your computer and locate the appropriate TXT file(s)
Apple - using Finder
If you're using a Mac computer with an OS that cannot run iTunes (macOS Catalina or higher), you can use Finder to retrieve files from your Apple device.
Connect your phone/tablet to your Mac computer via a Lightning cable.
Open Finder, click your phone/tablet in the left menu (below "Locations"), and click "Files".
Find the version of DJI GO you're using and click and drag the "Flight Records" folder to your desktop.
Android
For Android mobile devices, connect your mobile device to a computer via a USB cable and go to:
DJI GO 3 - "DJI\dji.pilot\FlightRecord"
DJI GO 4 - "DJI\dji.go.v4\FlightRecord"
DJI Fly
"DJI\dji.go.v5\FlightRecord" (for older versions of DJI Fly)
"DJI\dji.go.v5\files\FlightRecord" (for iOS devices)
"Android\data\dji.go.v5\files\FlightRecord" (for Android devices)
If you're using an Android device and the log files aren't visible or you're not able to find a specific log file that should be there, then restart your mobile device. If that doesn't work, you can try to install and run SD Refresh to try and retrieve the file(s).
Phantom 4 Pro/Adv controller
Connect a USB cable between your computer and the micro USB port on the back of the remote controller.
Swipe down from the top of the screen and tap the “USB connected” message.
Tap the down arrow on the bottom, left of the screen to reveal the “TURN ON USB STORAGE” button.
Tap “OK” to confirm you want to enable USB storage. You should get a message saying "USB Storage in Use"
Copy/move the files to your computer like you would when connecting other external devices.
The DJI GO flight logs can be found in “DJI\dji.pilot.pad\FlightRecord”. Cached videos can be found in “DJI\dji.pilot.pad\DJI_RECORD”.
DJI Smart Controller
Follow these instructions to copy TXT flight logs from the DJI RC remote controller to a memory card:
Power on the DJI RC remote controller.
Open the door on the bottom of remote controller labeled HOST/MICRO SD and insert a memory card.
Swipe down with your finger from the top of the remote controller screen two times to access the Quick Settings screen.
Tap the nut icon at the top right corner to access the Settings screen.
Tap Storage.
Tap Internal shared storage.
Tap Music & audio.
Tap Audio files.
Tap the three dots menu icon at the top right and tap Show internal storage.
Note: This menu item will show Hide internal storage if the internal storage is already visible.
Tap the three lines menu icon at the top left to access the Files screen.
Tap DJI RC near the bottom of the Files list.
Navigate to the DJI RC\Android\data\dji.go.v5\files\FlightRecord folder.
Select the TXT files you’d like to copy by tapping and holding each file. A blue check mark will appear after a file has been selected. Or tap the three dots menu icon at the top right and tap Select all to select all files.
Tap the three dots menu icon at the right and tap Copy to….
Tap the memory card from the Copy to… list.
Note: Your memory card might be named something other than android if it was not formatted from the DJI RC remote controller.
Tap the Copy button from the bottom right to copy the selected TXT files to the root of the memory card.
Remove the memory card from the remote controller and insert it into the device where you’d like to transfer the TXT files.
This information is reproduced from the original source on PhantomHelp forum.