PSD + transparency = white outlines

I want to know, how would you guys export 2D semitransparent layers from PSD for import to UE4 (and have correct borders/alpha). Exporting TGA files (videotutorial here Unreal Cascade: Making Proper Alpha Channels for VFX - YouTube ) from every PSD is time consuming. Also when I make edit of PSD, I have to re-export new TGA that have different positions and re-import in UE4 make mess with whole scene.

There must be a simple way, how save PSD with correct alpha and imprort it in to UE4.

There is test PSD: https://drive.google.com/file/d/0B0uYVWhdF5Dcc2R0M1NNSFhjbk0/view?usp=sharing
There is edited TGA: https://drive.google.com/file/d/0B0uYVWhdF5DcQW1NckRzMEhVMEU/view?usp=sharing
There is screenshot of imported PSD: https://drive.google.com/file/d/0B0uYVWhdF5DcYnA0YVo2TDhFbzQ/view?usp=sharing
There is screenshot of imported TGA: https://drive.google.com/file/d/0B0uYVWhdF5DcUnZaelpYUFNLN2c/view?usp=sharing

What is wrong with my PSD? How can I get off that white outline? Thanks for any help.

It seems like the way PSD files are imported is just flawed. I also asked about it here, but there doesn’t seem to be a solution.

Possibly you could use Photoshop’s script event manager to automatically save a TGA copy of your file whenever you save the document.