The pictures that appear in your All Pictures list include
- all of the pictures you create
- all of the pictures you've been invited to as a contributor
If you were invited to contribute to a picture, but it does not appear in your All Pictures list, it is possible that the owner removed you as a contributor to the picture or the album that included the picture.
If you had access to the picture because it was part of an album you'd been invited to, then you'll lose access to the picture if the owner removes it from that album. All Ponga pictures are private, only the owners can invite contributors.
Feel free to reach out if you have questions, just drop a question into the Ponga chat box.