.gz extension not regocnized as valid Archive name?

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Hello, I have created a package with Duplicator and copied it through FTP to another server. When I fill in the name of the created package, which has a .gz extension, I get the Invalid Archive Name!-error. But it is the name Duplicator created itself. What can be wrong?

Hartelijke groet,

Joke Portegies

The page I need help with: [log in to see the link]

 

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