Thank you!!! The doors are only hanging from the top, with something similar to a closet door track. It's free on the bottom, aside from wood to guide it. This is because of the issue with shavings and dirt falling into the track causing it to become clogged and immobile. We put a board up to block shavings from falling in that crack for the front doors and the door to the run (the board is on the inside of the coop) but I still have to scrape debris out of there every 3 or 4 weeks so it will close completely.
Here's the front sliding doors.

Here's the front sliding doors.