Adding a Pause Button to your iPhone Video Recorder
Unlike a real video camera, when you record video using your cellphone, there is no "pause" button (yet, I'm sure Apple will add it someday). That means when you're recording a skit or "newsroom" broadcast and need to change scenes or actors, you can't pause the recording, you have to stop it. Then when you press START again, it creates a new video file. ANNOYING. And when you go to play back the skit or newscast, you have to play several files to show it all. Like I said ANNOYING !
But there are several free video apps you can download from the app store that give you a PAUSE BUTTON so that you only end up with a single file to view and share 
There are several and some are better than others. Currently I'm using one called "Nonstop Cam" because it has the fewest interrupting ads and easiest to understand features. (I tried "Clippy" and "PauseCam" and a few others. Their in-app ads were annoying and controls were messy.)
Here's What Nonstop Cam" looks like on my phone. When I'm recording and hit the record button, it pauses the recording. When I'm all done recording I "export" (save) the file to my Photos.
Easy to use.
When you install an app like this, you'll need to give it permission to use your video camera, microphone, and access your photos to save its files.
I know Android phones have similar apps. Look for them in your Google Play store.