I want to upload a new version of my research proposal. I can remember to have seen an automatic attribution of a DOI to the accompanied data file, but I don't know how to retrieve it. Maybe it was deleted because initially I declared it as an article. But it was never published in a journal. Now, I want to upload a new version in form of a preprint. Should I delete the old version? And I would like to get the DOI before uploading because I want to add it to the preprint next to my email address so readers can retrieve the data later.

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