How to create a state variable of type "Document Reference" and store html files in app state?

I am trying to create an app state variable of the type "Document Reference" and the reference type should be .html files. The purpose is to store many HTML files in the app storage in a variable and to show the HTML file's data in a page in my app.

However, when I try to create a variable of "Document Reference" type I am not getting any options in the "Reference type" field. I am not also being allowed to create such a variable without putting something in that field.

Here is an imagehttps://files-us-east-1.t-cdn.net/files/utFNiokbJG7qCCKb2lTpO

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