Congrats on your new Phantom and welcome to Phantom Pilots!
There are two types of flight logs -- TXT and DAT. The TXT flight logs are created by DJI GO and stored on your mobile device. If you're using another application
(e.g. Litchi), the flight logs will be stored in a different file format
(e.g. CSV). The DAT flight log is created by your Phantom and stored on its internal memory card
(this memory card is inside your Phantom and is not removeable).
Like DJI GO, Litchi will also create a flight log on your mobile device. That flight log will record data as long as your Phantom is connected to your remote controller
(via the downlink). If it disconnects for some reason, no additional data will be stored in the flight log until it reconnects.
Litchi flight logs are stored in CSV format.
DJI GO TXT flight logs are stored in a binary format and the data within is encrypted if using a version of DJI GO newer than 2.8.3. The unencrypted logs can be read by
these log readers. If using the latest version of DJI GO, only
Healthy Drones or
DJI Log Converter are able to decrypt and display them. Healthy Drones displays a very limited set of data, so you'll want to use the DJI Log Converter if you need to access all of the data in the flight log.
The internal DAT flight logs contain more data than flight logs created by DJI GO, Litchi, etc. You can access those flight logs using the DJI Assistant 2 application
(like this), but there is currently no way to view the data within them.
As for consolidating your logs, Healthy Drones is the best option available. You can use their
HD Sync application or Litchi to auto upload your flight logs. Once uploaded, they can be easily viewed from their website.