I found that textures in Content Browser can’t display it’s alpha channel,only for RGB channel. Just like in texture editor, I can see RGB+Alpha channel to display .
How to set? or I cannot set for this? alt text
Edit the texture, Change the “Texture Group” from “World” to “UI”.
But UI texture group will disable the mipmap, which is a significant optimizing method for world textures, while UI doesn’t need it.
So you better set the “Mip Gen Settings” to “Simple Average”.
If you have many textures needing changes, select them all, right click> Asset Actions > Edut Selection in Property Matrix. You can edit them all at once there