Q: Can the form data submitted be used to populate a PDF form?
If so, can we present the completed PDF form to the submitter at the end via a download link or via email? Can we also automatically save that same PDF to a OneDrive folder?
Yes, you can generate a PDF with submitted form data and send it to the user via email.
PDF via Email: Bit Form supports attaching a filled PDF form to email notifications.
OneDrive PDF Saving: Bit Form does not currently support automatically saving the generated PDF to OneDrive. The OneDrive integration is only for attaching uploaded files via the form.

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Can files uploaded through the form be included in the email notifications along with the PDF?
Yes, this is possible. Files uploaded through the form can be included in the email notifications along with the PDF attachment.
More Details: https://bit-form.com/wp-docs/apply-conditional-logic-using-bitform/setting-up-email-notifications/#set-up-email-notification
Supporting document: -
PDF Attachment Guide: https://bit-form.com/wp-docs/pdf-attachment/
OneDrive Integration Guide : https://bit-form.com/wp-docs/bitform-integration-list-and-guides/onedrive-integrations/