How can I incorporate photos and videos that are in my phone but are not in the DJI FLY Album to create a video in DJI Fly Editor?

If you have an iPhone you can use iMovie for free to do this.

I have a Samsung Android.  I would like to edit in the DJI Fly editor program already in the software but cannot import any videos that were not taken by the drone and downloaded to the Album,  Some YouTube tutorials say you can do this but do not explain how.

  

.   Select the DJI Fly at the top and it takes me to photos on the device, but I do have an apple product.

Thanks, I have an Android Galaxy A71 phone and I can't get the photos or videos to the editing app.