Include picture that is already available as attachment

Dear All,

I'm currently facing an issue with confluence when I want to include a picture (or file) that is already uploaded into a site.
The macro for including files and pictures only has 2 options "upload from PC" and "upload from link". Some time ago there was also an option "from existing files".

Can someone tell me, if this is some kind of a setting that I have failed to set or if this funciton has been removed? Is there another way to add existing files in sites?

Thank you for your support.
I'd appreciate any hint.

Best Regards
Simon