The NuPhys2019 Proceedings will be available online using the online archive Zenodo. With the consent of the presenter, slides and/or poster will be uploaded to Zenodo by the organisers after the conference. The contributions will get a DOI (Digital Object Identifier), and thus, will be uniquely citeable. More details on Zenodo can be found here.
If a presenter wishes to upload a typeset traditional contribution to the arXiv, the organisers will link this manuscript to the conference proceedings if notified of the arXiv number before 1 April 2020. Note that this is completely optional.