Here’s another way
If you are using them a lot within the project, this is a quick win.
Creat a new sequence name it flash.
In the new sequence make a white matte about 12 frames long,
after 6 frames insert an opacity keyrame,and drop the opacity down to the end at 12 frames.( this will give you a nice drop off).
Add a ‘camera click & motorwind’ sound effect.
You can then drop the flash sequence into your edit wherever its needed.
Andy