Part 107 UAS pilot reported the UAS crew was approached by airport staff during a flight near an airport. The UAS crew chose to end the flight.

Narrative

On Day; we were performing an aerial topography with our RTK drone near the ZZZ airport along the road within the Park subdivision at roughly XA:00 PM. We were approached by an employee from the ZZZ airport and he proceeded to ask us questions regarding our drone operations. He asked for my name; FAA pilot license; company name and client information. He also took photos of my pilot license and our equipment. The Airport person when he approached did not present any credentials as to who was or his position. He mentioned he had received a complaint of a drone flying close to the airport and was there to investigate. He did not ask us to abort our drone operation; but we voluntarily did so. We provided all information requested and explained our difficulties with the Aloft app to get authorization to fly. The app would give us a cancellation notice within minutes of submitting the request or it would just freeze. With that happening; I figured that we didn't need authorization since the area that we needed to fly was not in the Red Restricted area shown on the map. We did have to request to fly so close to the ZZZ1 property or the drone would not leave the ground. We were trying to get all the proper authorizations to fly the drone legally.