Sony FDR-X3000 Read This First Manual page 73

Press the
3
movie.
Select a movie that you want to add in a highlight movie from the date or the
4
content list, then press the "Next" button.
The highlight movie creation starts.
You cannot select MP4 and XAVC S contents at the same time.
You can select up to 100 movies by date or file.
If you disconnect Wi-Fi connection of the camera and your smartphone while creating the
highlight movie, the camera continues to create movie.
Press the REC/ENTER button of the camera to finish creating the highlight movie.
icon to select a content format that you want to add in a highlight