I have already followed this guide
https://help.dropbox.com/create-upload/ios-formats
however, after it is uploaded to Dropbox, it shows up as .mov file
facts of the current situation
- HEVC format was preset prior to commencing upload of auto backup
- original file on iPhone 15 Pro is HEVC, standard 1080p video
- photos that are heic on the phone are uploading as heic
- rebooted phone doesn't solve problem because backup has already started and no option to tell dropbox app to stop uploading
- app has been delete, phone rebooted, app reinstalled from app store.
- videos are recorded with default camera app
- iOS version: iOS 17.5.1
- Dropbox app version: 384.2 that was updated 1 week ago as of posting

Camera upload settings page