Changing the hero icon.

Good day. The white background is related to the fact that you either don't have an alpha channel or it's not configured.

In the Channels section, add a new channel and paint white the areas that should be visible, black the areas that should be transparent, and save. Then everything will work correctly!

Here is the result of the screenshots above:

Thank you very much, your method really helped me! I knew the problem was with the alpha channel, but I didn't know how to fix it.

Added 40 seconds ago

Hello. I have a guide in my signature: How to create your own hero?. It also discusses adding an icon.

Thank you, I will definitely check it out. I think the skill of creating new heroes in general will be useful to me!

Added 31 seconds ago
Thank you very much to everyone who responded! I thought I would be ignored and no one would answer, but there are so many responsive people here that it's a little awkward :)

Added 51 minutes ago
Damn, a new problem has arisen, I'm inserting a picture, and it seems like I'm doing it as described above, but white spots are visible on the character's avatar. For example, Faramir has white highlights near his hair, everywhere a little, I tried adding more white and black, and also cropping the image itself, but it doesn't work.*
https://imgur.com/a/3AhgNVS