We are working on improving the Method simulation. However, in general the application doesn’t support File Transfer (that would probably be something separate from any method simulation, at least any “real simulation” as it requires state handling etc.). And our SDK doesn’t support the “temporary FileTransfer” types at all (you can plug an implementation manually to the Methods though), thus probably why that is the error code.

But we can continue by mail in case you wish to try a beta for improved method simulation (though that will require the pro-license).