Sprites disappear in preview

Hey guys, newbie here.

I am working on expanding the Platform Tutorial project, and I've encountered a weird problem where my sprites (playerboxes + playeranimations) disappear when I hit preview.

I've searched the forums for a similar issue but couldn't find anything. I checked the Z Order Bar, but that didn't help either.

Here's my project file:

https://drive.google.com/file/d/1NB7BbHQNzAxx6Kbkfj2b5AA3zffYyTyl/view?usp=sharing

Any help would be appreciated.

Your "Chars" layer is invisible.

Also, you need to enable collisions on PlayerBox sprites.

I didn't know that layers had their own property panel {facepalm}.

Thank you sir!