Hi ConsultD. No, currently one cannot add photos to an existing Photosynth. If you one wants to change anything in the collection of photos of a Photosynth, then one has to create a new Photosynth. Photosynth uses the order of date/time taken for its composition. So, it will be best if you assure the order of date/time taken in the properties of your photos to match the order in the path you want. However, if there is a flaw in the date/time sequence, Photosynth will still try to make the best match based on the images themselves.