PeopleSoft Supplier Contracts--file formats supported

Our users have a lot of confusion about what file formats are supported when in Supplier Contracts--Document Management. For example, when importing a document, they can import a Word doc, PDF, or XML, but it doesn't always mean that they will be able to see the Prepare and Route for e-Signature (we use DocuSign) after approval. For example, when uploading an initial document as an XML file, the e-Signature button does not appear. So the workaround has been to check out the document (edit), save as a Word doc, then after checking the document in and approving the Prepare and