Ports, forts, and ground units?

[MarkShot]

You can build a fort at a port, you can drag and hover a ground unit stack over the port (text flashes). However, when you drop the unit, it does not seem to enter.

Am I missing something or can ports only shelter ships exclusively? If so, then shouldn't this dropping behavior for ground units be changed?

Thanks.

[PhilThib]

Ports only shelter naval units indeed. The dropping feature for land units is used when there are naval units in the port and you want to load land units on to them.

[Pocus]

1.05: the blinking text should now only been seen if a fleet is in the harbor