If you are using Confluence Server/DC, you need to set up the draw.io app to use our conversion servers, as .vsd, .vss, and .vdx files cannot be converted on the Confluence Server instance itself.
vsdurl=https://convert.diagrams.net/VsdConverter/api/converter option to the draw.io app configuration script.
To convert Visio diagrams containing EMFimages, add the
emf2png=https://convert.diagrams.net/emf2png/convertEMF option to the draw.io app configuration script in Server/DC.
The entire diagram file is sent to our servers, which have our usual strict security policies applied.