This might help Library management in KiCad version 5
And of course this: Tutorial: How to make a footprint in KiCad 5.1.x (From scratch)? (last section is about 3d models, link should point directly to it)
This might help Library management in KiCad version 5
And of course this: Tutorial: How to make a footprint in KiCad 5.1.x (From scratch)? (last section is about 3d models, link should point directly to it)