If you get message when trying to upload a template to Templafy, it is because the file you are uploading, has been downloaded from the end-user interface.
When a dynamic template has been downloaded by an end-user this is now a personalized document and it no longer holds any dynamic capabilities.
If you want to edit an existing template, you need to download this from the admin interface directly.
If you have a document that has been created via Templafy end-user interface, then this has a set of document properties that tells Templafy, that this is a document created via Templafy.
If you do want to upload this document to a Template library, then you can manually delete these document properties
Delete Custom Document Properties: