Why doesn't bevel work on my object? I have made an object out of a cube, that I applied boolean and mirror modifiers. Now when I apply Bevel, I don't see anything. I want it to have slightly rounded edges and corners.

It doesn't seem to make any change if I disable the other modifiers or move Bevel higher up.

Here's what my object looks like:


It works on a cube, and here's what I want the edges to look like:



Here's my blend file:



Appreciate any help!
Merge the vertices by distance and then it will work, just tested