photos
why when taking a photo do i get a video instead?
iPhone 11, iOS 13
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Are you referring to Live Photos? See: Take and edit Live Photos - Apple Support
If you want that option off, see the following from the same link:
How to turn off Live Photos
Tap the Live Photos button 
to turn off Live Photos. A slash through the Live Photos button means the feature is off.
The Camera app turns Live Photos on again automatically. To keep Live Photos off permanently, follow these steps:
- Open the Settings app.
- Tap Camera > Preserve Settings.
- Make sure that the switch next to Live Photos is turned on.