At the moment we do not have a sample on how to upload a file ( for example a document ) to a module because this is not implemented as a definition element in the Sitefinity module.
To upload a document refer to this sample that can either be added as a new custom field that will select the document or it can be integrated to the module and used as definition element that will select a document.
In the selector change the services to use document selector service
This will select document from Sitefinity document library.
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