Path to asset file shows "Template not found!"

I have a headless Craft CMS site and now the frontend development should start.

I have absolutely no frontend or templates as I only worked on the backend.

The asset url got created at /images. If for example the file 1.jpg got uploaded it should be shown in example.com/images/1.jpg when I click on view in the file manager in Craft.

Sadly I get the error Template not found when I only want to see the uploaded file or rather get access to the file.

What can I do to get access to the assets from my asset link /images?

Thanks in advance!