Scenario: There are forgotten photos in another folder, or there will be newly captured photos in the next few days. I want to merge with the current processed data, but I don't want to reupload from the beginning.

Answer: Currently, Propeller received each photos from uploading has to be preprocessed then add to the database, and this step uses the credits for processing. 

Due to the web view policy, each uploading is unique. This means to merge extra photos, it has to reupload all the photos together and this may cost another credit for generating all the outputs such as orthomosaic, DEM,  point clouds, and so on.