permalink: /?tegory%/%postname% no images

I have just changed my permalinks. They are now customized at /%category%/%postname% on https://www.andreashuesch.de

Everything is fine, I get access to all my posts, but when I click on an image, I received the following error-messge:

404 – The Server can not find it !

The post or the page that you are looking for, is not available at this time. It could have been moved / deleted.

Please browse through the archives / search through the site.

Let’s take an example: https://andreashuesch.de/southern-highlands/spider-watch

.de/southern-highlands/ is the category
.de/southern-highlands/spider-watch is category with the name of post (spider-watch). It works, fine! But please click on the image, and you receive the error-message.

Can you please help me, with this issue?

When I changed the permalink-structure it said, that “permalink hast been updated” so it didn’t mention the .htaccess

What do you think?

Cheers,
Andreas