AppVeyor server, use CAKE uploading artifact failed

[mikefoxnobel]

I'm trying to move project's CI from AppVeyor website to local AppVeyor Server.
The existing project is using "cake" script, which is successful running on AppVeyor website.
But after I set local AppVeyor Server, it build successful but uploading artifact failed.

Error message is:

========================================
Publish
========================================
Error uploading artifact to the storage: One or more errors occurred. (Artifact not found or access denied.)
An error occurred when executing task 'Publish'.
An error occurred when executing task 'Auto'.
Error: One or more errors occurred.
	UploadArtifact failed (2).
Command exited with code 1
Build failed

The cake code which cause exception:

var publishTask = Task("Publish")
	.IsDependentOn(packageTask)
	.WithCriteria(AppVeyor.IsRunningOnAppVeyor)
	.WithCriteria(!isAppVeyorPullRequest)
	.Does(() => 
{
    AppVeyor.UploadArtifact(zipFilename);
});

AppVeyor server installer file is: appveyor-server-7.0.2546-win-x64.msi.

Did I miss some setting?

[FeodorFitsner]

Can you push artifact without Cake, e.g. with artifacts section in appveyor.yml or via appveyor PushArtifact <file> command?

[mikefoxnobel]

The artifact file name is generated in Cake, with version number and SHA. It's hard to process in appveyor.yml.

And, where to run appveyor PushArtifact command?