Can't open VSD Files

OmniGraffle OmniGraffle for iOS
#1

I got the pro version. How do I get a VSD file?
I tried holding the file on e-mail, and use the “open with” dialog. It doesn’t list OmniGraffle as being able to open the file.
Also tried to use iCloud provider. It shows the file, but the file is grayed out, so I can’t open it.

Any help please? I confirmed my version is indeed the pro version.

Exporting to .vsdx files
#2

I’ve seen this too. It seems that you have to get the VSDX file instead of the VSD file. At least when I rename to VSDX, it lets me open. I note that when I Export as Visio, the extension is VDX.