Hm. Are you sure that .zimage file is a good file?

Where is the file stored? It should be on a local disk drive not on a network share.

What software are you using to upload it? Is it the latest Logo Editor program?

Try this, try using the latest Logo Editor, and open an Explorer window with that file. Then drag and drop that file onto the Logo Editor window. See if that works.
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Tony Fabris