Yes, uplift is the wind lifting the roof off an open structure.
When the post tenon is cut for a corner post to plate connection normally we don't make it a full width tenon, because if we did it could come right out to the end of the plate. So it is cut back usually 2" from the surface of the post that would be the gable end of the building.
As shown here:
In the above exploded drawing, I have moved the plate up and rotated it so that we could see the tenon and the mortise in the bottom of the plate.
I set the top of the tie to be flush with the bottom of the plate before the housing was cut into the bottom of the plate.
And I followed the same rule that the tenon on the tie beam should be cut back as it is within 2" of the end of the post.
I moved the tie beam back so we could see the tenon. This tenon is now 6" tall instead of a full 8" tenon.
This will allow 2" of relish above the tie beam mortise in the post before the tenon on the post to connect to the plate.
All tenons and mortises are 2" off the face and then 2" thick.
With the post top tenon into the plate 6" it would be hard for the post to split much if the tenon was tight to it's mortise.
But if it did split you could put some fasteners into the post above the tie beam mortise to hold it together. And cover these with some peg ends so that they don't show.
Just my ideas on the subject.
Jim Rogers