Respect URI schemes when attaching a link to a card
It seems there is no way to link to a local resource (link to Onenote page "onenote:///...", link to file "file:///...", link to compose mail "mailto:..." etc.)
Agreed. We internally use trim:// browser protocol to work with files in our corporate document management system.
You want to put in a layer of protection, sure, but at least give us the option the standard, supported, and totally legitimate use of custom protocols.
My concern here is that you're too interested in pushing your own cloud storage options to let us operate the way that works for us.
Zig Mandel commented