Ten minutes with EverStamp at the pick-up and again at the return: every side, the dashboard, the fuel and every scratch, each photo with the date, the time and the place in it, timestamped by an independent service.

The damage charge comes by email weeks later, with their photos and not yours.
Your own pictures show the car, but not convincingly when. The other side only has to say they are from later.
Pick-up is rushed and the car park is dark. A checklist makes sure the tyres and the roof are not the part you forgot.
The Vehicle handout template in the app asks for at least four photos of the outside, two of the inside, any existing damage, and the fuel or charge. At the return, Vehicle intake adds the number plate and the mileage as fields.
On Vehicle intake the plate and the mileage go in as fields, under the same signature as the photo. The app reads along in the viewfinder at that step and proposes them; you confirm.
Every side, the inside, the fuel and every mark, following the checklist. It works in an underground car park with no signal.
An independent service timestamps it. The time of your photos is then fixed, not just claimed.
A second file at the drop-off. If a charge comes, you send both.
They open the file in the browser, with no account and nothing to install: every side of the car, the fuel and the mileage, with the time from an independent service.

No. They open the file or the link in a browser. Only the person taking the photos needs the app, and Basis is free for one file a month.
The app carries on. Each photo is signed on the phone straight away, and the file is sealed once you are back online. The file shows how long that took.
Yes, in the same way: every side, the inside and the mileage on the day you hand it back.
Pick-up and return are two files. Basis gives you one a month; Plus gives you five.