Protect people before documenting
Do not delay emergency help, enter an unsafe area, or interfere with responders. If it is safe and lawful, record broad views and details that establish context. Different incidents require different context.
Keep the original files
Retain the file produced by the phone, camera, dashcam, doorbell camera, or messaging service. Editing, cropping, annotating, forwarding, or uploading can create a new file and strip information. Make a separate working copy and leave the original unchanged.
Record origin and custody
Note who created the file, the device or account used, the approximate time, where it was stored, and any transfers. Use clear filenames on copies, but do not rename your only original. Tell your lawyer promptly if another person or business may have time-sensitive video.
Back up without oversharing
Keep at least two secure copies in locations you control. Review automatic social-media sharing and shared-album settings. Public posts can disclose location, health, or activity information. Ask before sending sensitive files through ordinary email.