Hello everyone. Maybe you are experiencing the same problem. For some time now (before everything was going well!) when I put new versions of my preprints online, the DOI is not updated (a new number should appear at the end of the DOI). In addition, the old one is no longer valid (since I delete the old versions). I have not changed my way of doing things: I add a new file then I delete the old one, before this automatically modified the DOI number. for example 10.13140/RG.2.2.12906.02240/2 becomes 10.13140/RG.2.2.12906.02240/3. But now no, no more updates and no link to request a new DOI. Above all, do not suggest that I completely delete the publication because that resets the reading statistics! Thank you for your help.