Your Apple Watch can already control the iPhone camera: Apple's built-in Camera Remote app shows a live preview, snaps photos, and can start and stop a basic video recording. What it cannot do is buffered capture, saving the seconds from before you tapped. For that, Video Buffer Action Camera ships its own Watch companion, so one wrist tap after the moment saves a clip that starts in the past.
What Apple's Camera Remote does, and where it stops
The Camera Remote app that comes with every Apple Watch is genuinely useful for group photos: prop the phone up, walk into the frame, tap the shutter from your wrist. It also starts and stops plain video recording. But it drives the standard Camera app, which means recording begins the instant you tap and not a frame earlier. If the moment already happened when your finger reached the watch, the moment is not in the video. For posed shots that is fine. For sports, kids, and anything unscripted, it is exactly backwards.
A record button on your wrist, with a memory
Video Buffer Action Camera keeps a rolling buffer of the last seconds while the phone camera is open. Its Watch companion turns your wrist into the record button for that buffer: tap to start recording, and the saved clip includes the buffered seconds from before your tap. Tap again to stop.
It goes further when you turn on Multiple Buffer Times in the phone app's settings. The phone then shows three record buttons, Left, Main, and Right, each with its own buffer length, and the watch shows the same three, each labeled with its seconds. A quick laugh gets the 5-second button, a full play gets the 100-second one, and you choose from your wrist, after you have seen how big the moment was.
The watch tells you what is happening
A remote you cannot trust gets checked constantly, which defeats the point. The watch screen shows the recording state the whole time: it switches to a recording indicator when the camera is rolling, shows FINISHING while the clip is being written, and SAVED! once the file is safely stored. If the phone side is not ready, the watch says so and tells you to open the app on the iPhone. You never have to walk back to the tripod to find out whether your tap worked.
Why a remote matters more with a buffer
Here is the setup this unlocks. The phone sits on a tripod at the gym, the pitch, or the living room, framing everything. You are not behind it. You are courtside actually watching the game, or in the frame yourself, or twenty meters away helping with the drill. The buffer means the camera never misses anything, and the watch means you never have to be near the phone to keep anything. See the goal, tap your wrist, and the goal is saved, including the build-up from before your tap.
Compare that with filming by hand: you watch the whole game through a screen, your arm aches, and you still have an hour of footage to scrub through. With tripod, buffer, and watch, you watch the game with your eyes and go home with only the clips.
No watch? Use the volume buttons
There is a second remote trigger that needs no extra hardware at all: pressing a hardware volume button toggles recording. That is handy when the phone is on a selfie stick and your thumb rests on the button, or when the phone sits in your jacket pocket at chest height and you want to trigger it by feel without looking.
One honest note
The watch triggers capture only. Buffer lengths, camera format, and every other setting are chosen on the phone, before you walk away from it. Set the buffers up once at the tripod, and from then on the wrist does the only job that is time-critical: the tap.
Do this in Video Buffer Action Camera
Install the app and its Watch companion appears on your Apple Watch. Start and stop buffered recording from the wrist, and with Multiple Buffer Times on, trigger the Left, Main, or Right buffer, each showing its seconds. The watch reports FINISHING and SAVED! so you know every clip landed, while the phone records in up to 4K and saves to Photos, Files, or iCloud Drive.
