It won't show up in the CMSDesk. It will show up in the Site Manager>Development>CSS Stylesheets>Your stylesheet>Theme tab. Under there you will discover your picture.
I should state, if the templates code name is the same as the index name in the record framework, at that point it will appear there. This is the situation if the template was made inside the UI. In the event that the App_Themes/Companyname registry was made in the record framework and the template was not made in the UI you won't discover what you are searching for without heading off to the document framework.
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