You can read an overview, or watch the video below of the integration (please note that certain aspects of the video may seem outdated, as both the iAuditor and GeoOp apps have been updated - however the underlying concepts are still the same).
To attach a file from iAuditor into GeoOp, firstly use the iAuditor app to create an Audit.
You can then press the Preview button to view the Audit as a PDF.
Tap on the Open With button, and select the "Open With GeoOp" option.
You can then select which GeoOp Job to attach the file to.