These include templates of academic courses, proof of employment, and skills. You can select a template, fill in the information, and send it out. You can upload a PDF file to the template to generate a file hash, which will be authenticated or verified as part of the credential. The PDF file can be sent to the authenticator (verifier) by third-party applications (social apps, email, etc.). After receiving the invitation, the authenticator (verifier) needs to upload the same file to verify whether the file hash matches for authentication (verification), thus ensuring that the PDF file it receives is the one uploaded by the sender when editing the credential.