Gemini Flash checks your photo against the habit you picked and tells you what to fix when it fails. Aura never views or stores the image. The usual causes:
Get the whole thing in frame. The corner of a book is harder to read than an open book on a table. Whatever the habit is about should be the obvious subject of the photo.
More light. Verification struggles in the dark for the same reason your eyes do. A lamp usually solves it.
Photograph the thing, not yourself. For Read, the book is the subject, not a selfie with a book somewhere behind you.
Photos of screens don't pass. A picture of another photo, or of a video of someone else's workout, is rejected on purpose. Photo Proof needs to show verification.
Check you picked the right habit. A photo of a tidy kitchen won't pass for Read. It's a more common mistake than it sounds, especially if you have several habits set up.
If it's still wrong. Verification isn't perfect and it will occasionally fail something real. Retake once with better framing and light. If it fails again on a habit you genuinely did, email help@downloadaura.app and tell us which habit. That's how we improve it.