The model looks really cool. I can open in with the War3ModelEditor. It doesn't show up here in the preview and neither in the World Editor. I calculated the extents in Mago's editor and reimported it and now it works. Please do this and reupload the model here, so it works here as well.
Can you add some more animations:
- Stand Work
- Stand Alternate: Disabled Portal
- Morph: Enables the portal
- Morph Alternate: Disables the portal
- Death
- Build
The Death and Build animations could be copied from some other models. It helps to use it as regular building rather than a Doodad.
Otherwise, I have to hide the unit when it is killed and add some custom explosion effect.
The work animation would allow it to train units.
The disabled animation helps to use it as disabled portal.
You could try to use more Warcraft III/Reforged textures from the existing Dark Portal of the game and only use custom textures for the really new stuff like the glowing etc.