Thanks for all responses, the directions there all were valid for me.
My drone is a BeBop 2 Power, my FreeFlight Pro with the purchased Flight Plan in-app is version 5.2.7.
I am using an Android 7.1 smartphone, and a few weeks ago I received a FreeFlight app update.
Strange enough you are talking about FF6, and I have not received and update for this version 6 yet.
Using the Search for updates option of the main menu, I only can see listed the hardware, that is, the firmware version of the BeBop2Power drone, and that of SkyController2, but there is not an entry for the app itself there.
In the FreeFlightPro app, tapping in the free drone memory graphic at the top, I can see the files that actually are in the drone memory, and I am able to transfer one or several of those files to my phone, so using this way I can check if the videos are correct or I need to fly again. This option is enough for me for what I where looking for.
In the app, I can access to the Gallery files, but in that place there is only a list of files already transfered to the phone, not the files that actually are in the drone memory.
I can not locate the SD Card icon that Rocky is talking about, perhaps it apears only for Anafi, or for FreeFlight version 6.