Thanks everyone for confirming!
I'll start sending more detailed check-in instructions with images and see how it goes. I'm having problems with guests arriving at the wrong door and bothering my upstairs tenants. I specifically tell them to use the side door with the keypad lock and NOT the front door, but a good portion of guests still go to the front door and ring the doorbell. Only when someone doesn't answer does the guest whip out their phone and start reading my check-in instructions and figure it out. I'm thinking of having a big photo of the proper door as the first image in my instructions.
When you guys send attachments are you using pdf or what? I do everything on my PC and am never a guest so I'm very unfamiliar with how guests see things on their end.