DJI Fly app - what does this button do?

[Chanctonbury]

Hi folks, I have been experimenting with the built in video editing software in DJI Fly but I cannot find out what one particular button does! I have circled it in red below.

Enlightenment sought, please?

Thanks.

 

[steve_lyt]

its the split clip, for putting a break into the clip

 

[Chanctonbury]

Thank you, much appreciated.