Remove background from watermark

Hi, @alex_kiosa ! Could you please explain bit more about this issue?
Regards Mantra Brain Support Team

My watermark png file – https://protline.ru/wp-content/uploads/2023/01/whatermark.png

In this photo (https://protline.ru/wp-content/uploads/2023/01/121-3d-lajt-3mm-1-600×600.jpg), the watermark is superimposed without a background color. And it’s ok.
But in this (https://protline.ru/wp-content/uploads/2022/12/3d-fence.png) photo the watermark is overlaid with a gray background color. How can I remove the background color here?

Did you tried to remove watermark from media option by selecting remove watermark already ?