Invisible/Transparent icon?

[Spartipilo]

Hi. In a map i'm making, I imported this BTN https://www.hiveworkshop.com/forums/icons-541/btnredbottle-151820/?prev=search=potion&d=list&r=200, also imported its counterpart (https://www.hiveworkshop.com/forums/icons-541/btnbluebottle-151863/)...

The thing is that the https://www.hiveworkshop.com/forums/icons-541/btnbluebottle-151863/ is correctly showing, but the https://www.hiveworkshop.com/forums/icons-541/btnredbottle-151820/?prev=search=potion&d=list&r=200 doesn't, its completly transparent/invisible, and only displays the Little black square for stack count items, tooltip, etc., but no icon at all. =/...

I've imported other icons and work perfectly, so I don't think i'm making a mistake... What could be the cause of this issue?

There's the screenshot.

 

[Shadow Daemon]

Yeah, all icons in BTNRedBottle.zip are transparent. I re-saved them with the format, in which blue bottle icons were.

 

[Spartipilo]

Omg... do you have wings and a holy aura?... Thanks! (Ironic, your name is Shadow Demon xD)