Actual Behavior

When you upload a media which contains a . in its filename but no extension the MediaStreamController pathcleanup will fail for example:

fitness-seasons.agency--C-&-C--Rodach,-Johannes.jpg

Expected Behavior

We should use the ExtensionGuesser from Symfony to get extension from the mimetype instead of using the pathinfo function.

Steps to Reproduce

1. Upload a file without a extension with the following name fitness-seasons.agency--C-&-C--Rodach,-Johannes.jpg

Possible Solutions

Use ExtensionGuesser from symfony to get the correct extension by mimetype instead of pathinfo.