Dravik is still in testing: if something's broken or confusing, hello@playdravik.com reaches a real person.
Point the camera at a real motorcycle and tap the shutter. Dravik checks on-device that it's plausibly a bike before doing anything else: a screen, a poster, or an empty frame gets flagged instead of wasting an identification attempt.
If it says it couldn't identify the bike: try a clearer angle, better light, or getting closer. Heavily obstructed or very distant shots are the most common cause.
No account needed: your garage lives on your device. That also means: no cloud backup today, and no way to move your collection to a new phone. Deleting the app deletes your collection with it. Deleting a single card removes just that card and its photo.
Camera: required to catch motorcycles; it's the entire mechanic. Nothing else asks for a permission today (no location, no photo library access).
What gets sent where, and to whom, is covered in full on the Privacy Policy.