Steps to reproduce the issue

I have several sites that use SVG-image-files.
Eg: YOOtheme.
These are not showing in the Media-manager.
Now I add the extension manual to the settings for the visualisation and the possibility to upload.

Expected result

With no manual intervention should be these files be visible and can be uploaded.

Actual result

These are not showing in the Media-manager.
Now I add the extension manual to the settings for the visualisation and the possibility to upload.

System information (as much as possible)

Additional comments