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I saved a flow in JSON format, but when tried to load it as a template the following error appeared: "The specified template is not in a valid format".

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I noticed the other templates I uploaded were XML files and not JSON. How can the template be saved as XML?

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Saving a flow is a different action than saving a template. The template should be saved by "Create Template" action, which saves it in the templates list of the Nifi instance. Then, it is accessible via the Templates menu item:

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Under the templates list, there is an option to download a selected template as an XML file. With that, the template can be exported and uploaded into another Nifi instance correctly without any error.

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