We are experts in the use of Visio to produce files, however, we need to produce the result as a Sketch file. How might we accomplish this or produce a file format that can be converted from a Visio file to a Sketch file?
Don't know anything about Visio, but if you can convert to SVG that would work (mostly) for importing. Quick Google seems it might be possible to Save As... SVG directly from Visio https://www.orbussoftware.com/blog/exporting-diagrams-from-visio-2013/
PDF could work too, but Sketch PDF importing doesn't seem amazing