Allow downloading files during export (with use of the osfclient project?) #118
Description
The OSF provides a way to download files for projects via the website, so development of v1.0.0 focused on things like project metadata that couldn't be exported as easily. However downloading files as part of the export process would make the process more convenient.
There is a project which focuses on uploading and downloading files from the OSF: https://github.com/osfclient/osfclient. It hasn't been updated since 2021 but is dedicated to uploading/downloading files from the OSF. It would be good to investigate incorporating parts of the osfclient project into this one, or keeping it a separate thing and reviving it.