When you're ready to start uploading photos you will need to login into katapultpro.com/upload or you can use the upload button from the 9-dot menu in the top right of the map.
The first thing is to offload photos from the SD cards to the computer being used for upload. It is always best practice to copy photos to the computers internal storage before uploading them into Katapult Pro. Users should not run photos through any importer software or any cloud storage, as they strip the images of the EXIF data needed for association and calibration.
It's also important to keep track of which photos came from which SD card. A best practice is to create a folder on the desktop of your computer or laptop with your initials and the date. Inside that folder, create two new ones, one for each camera the team used.