How to make thumbnail background transparent?

Question

Unity

Good morning everyone, I’m sitting for an hour, I’m tormented, I can’t figure out what I’m doing wrong, I’m
using the standard minishop2 gallery, a white background is added to the preview,
settings for downloading SSMaker.ru/c2f0fbd9
I’m uploading a file and it reduces the preview but makes this white background
SSMaker. ru/7e36a68d
the most interesting thing is that it even adds white instead of black to the default one, as specified,
what am I doing wrong? (

Answer 1

In general, I found a solution, it seems to be working so far.
Demolished Unity and Unity Hub, cleaned up all folders and registry. I downloaded the previous version of Unity, which does not require Unity Hub. In it, the activation of the license took place from 1 time without any problems.

Answer 2

A common problem is the built-in firewall, Windows Defender.
It is not easy to find him.
Windows Defender Firewall - Allowed Programs. You need to put all the checkboxes in the Unity editor.

Answer 3

in general, adding the parameters "bg":"","ra":1, gd helped