OM SYSTEM OM-5 Mirrorless Camera with 12-45mm f/4 PRO Lens (Silver) - Manual (Page 259)

Highlight [Yes] and press the OK button.
The edited movie will be saved.
To select different footage, highlight [No] and press the OK button.
If you selected [Overwrite], you will be prompted to choose whether to trim additional
footage from the movie. To trim additional footage, highlight [Continue] and press the OK
button.
259
Trimming movies (Movie Trimming)
8.