
When 3D files created in Blender are imported into a Unity project, they may appear standing vertically or positioned at incorrect coordinates.

This is because the coordinate systems of Unity and Blender are different, so to fix this, you need to adjust a few settings when exporting from Blender as FBX.
Check 'Use Space Transform' and 'Apply Transform', and select 'FBX Unit Scale' for Apple Scalings at the top. Then, set Forward and Up appropriately.

Then, you may encounter model data with beautifully arranged coordinate axes as shown below.

When starting with Unity, I used to create data only with Autodesk 3D Max, but now I am using only Blender, so I decided to organize this for the first time using this opportunity.