Exporting 2D rigged character from Blender to Unity

I've made a character in Photoshop, then used the export layers to png feature. Opened those in Blender using the import images as planes add on, pieced all of the layers together, and rigged it. Now I would like to export my character to Unity. I've tried exporting as FBX and also saving the project straight to my Assets folder in Unity. The character shows up as just a bunch of gray planes, all rectangular, I think their alpha channels weren't cut off? Their materials are also just gray. I'm new to Blender and Unity and I am unsure if this is an issue with the textures in Blender or if its something that needs to be fixed when exporting/importing?