How does a photo end up on the right job?

The top of the camera says where your photos go: Adding to the job when Handle is sure, or Which job? when it isn't. Tap it to pick another.

From the job's page, the camera adds to that job.
From Home, it picks the job only when it's sure you're there: you're at that job's address, or you just posted to it from the same spot. Otherwise you pick the job after the photos, before you tap Post.
On the wrong job after all? Tap ⋯ on your photo, then Move to another job. It keeps its time.

Did this help?