As we transition to the new Hyland Community, some post links may be temporarily disrupted as we finalize redirects. We apologize for the inconvenience and are working to resolve this as quickly as possible. Details.
Which section are you uploading the new PDF file into?
Is the rendition config that you described above defined on that section?
cmis:document=publicationpage1,ws:indexPage=sectionpage4
ws:image=ws:mediumPublicationThumbnail,application/pdf=ws:mediumPublicationThumbnail,application/msword=ws:pdfWebasset,application/vnd.ms-excel=ws:pdfWebasset,application/vnd.ms-powerpoint=ws:pdfWebasset,application/vnd.openxmlformats-officedocument.wordprocessingml.document=ws:pdfWebasset,application/vnd.openxmlformats-officedocument.spreadsheetml.sheet=ws:pdfWebasset,application/vnd.openxmlformats-officedocument.presentationml.presentation=ws:pdfWebasset,application/vnd.oasis.opendocument.text=ws:pdfWebasset,application/vnd.oasis.opendocument.presentation=ws:pdfWebasset,application/vnd.oasis.opendocument.spreadsheet=ws:pdfWebasset
If you upload the new PDF into the publication section on the sample site does its thumbnail appear?