The current function allows to upload an image file as attachment and automatically generate the image in the wiki page from the attachment:
- create wiki page
- use insert / edit image button
- choose attachment
- choose upload a new image and link to it
- choose a SVG file
- when clicking Ok, a message returns 'choose a graphic file' for SVG, while for PNG, BMP, etc the upload is executed and a link to the attachment is gererated which shows the image on the wiki page.
I did not find this list of graphic files to be configurable according to IBM Knowledge Center for Connections 6.