Just to clerify: You have enabled the photo upload in settings and specified a target vault?
Which pictures will be tracked depends on the Android version on you phone:
- Nougat (API level 24 or 7.x) and later: All images, which Android adds to the gallery will be uploaded to the vault.
- Pre-Nougat: Only the images created with the camera will be uploaded to the vault.
Could you send me a log file after creating some images? How do I enable debug mode on Android?