Redmine

My environment:

Rails 5.2.3

Ruby 2.5.3

Redmine 4

The scenario:

- Add new image PNG format to the repository SVN

- Preview the image PNG

I get an error:

ActionController::UnknownFormat (RepositoriesController#entry is missing a template for this request format and variant.

request.formats: ["image/png"]
request.variant: []):

lib/redmine/sudo_mode.rb:65:in `sudo_mode'
Started GET "/projects/active-power-filter/repository/31/entry/Documents/Overview.png" for 172.22.0.8 at 2019-05-30 10:53:09 +0000
Processing by RepositoriesController#entry as PNG