Change files in Child Theme not working

Hi,

i copied the “blog-single.php” to my child theme and did some changes on it. It does not work. With other files like “footer.php” or “header.php” it works very well.

When i change the original “blog-single.php” it will work directly. But that is no option for me. With every theme update i have to change it again and again.

Can you tell me what i did wrong? Or what’s going on? I have no idea.

Cheers