Unknown "fileIcon" function about mediabundle

[Arkounay]

The bundle uses artgris/FileManagerBundle and needs it installed as prerequisite.
It'll work if you add Artgris\Bundle\FileManagerBundle\ArtgrisFileManagerBundle::class => ['all' => true] in bundles.php (for Symfony 4, for Symfony 3 it should be something like new Artgris\Bundle\FileManagerBundle\ArtgrisFileManagerBundle() in AppKernel.php)

Then simply you can add this config (in config.yml for symfony3, or in a new file artgris_file_manager.yaml in symfony 4)

artgris_file_manager:
    web_dir: public
    conf:
        default:
            dir: "../public/uploads/"
            type: image 

[Quovandius]

Yes that's works

Can i notice an improvments of your Readme with your answer ?
I want to add this additionnals informations.

[Arkounay]

Nice. Sure, feel free to make a pull request :)