Why wont my custom tree mass place?

Using Blender I created a tree that appears sideways in my unity so I changed the size and such until it showed right side up. When it was right side up the mass place/paint tool didn’t work but when it was on its side the first time it was able to mass place/paint. Any help would be amazing!!

Checking ‘generate colliders’ doesn’t do it. You need to follow the instructions in the Tree doc, placing a capsule collider on the tree and making it a prefab then you can paint/mass place.