Uploading a form to Form Deployments

I am trying to upload a form .json to the form engine from the website.
The Upload form has an information text that says: "Select a .form, .json form file to deploy to the FORM engine. "

But after selecting the .json form file i get an error: “FlowableServiceException: File must be of type .xml or .form”

I suspect, that either the information message, or the check for the filetype is wrong?

I think the message on the popup is wrong. Does it work when you change it to .form?

Yes, uploading a .form did work.