Open the Photos app on your iPhone
Select a Live Photo, burst photo, or video
Tap Share
Choose an app or shortcut that can convert it to GIF
Use the Shortcuts app if needed
Open Shortcuts and add a GIF-making shortcut
Run the shortcut and select your photo or video
Save the GIF to Photos or Files
Use a third-party app from the App Store if preferred
Open the app and import your photo or video
Convert it to GIF
Save or share the GIF
Send the GIF through Messages, Mail, or social media