My Italian InDesign release doesn't create a Hi Res preview image.
In the preferences I've flagged the "always save preview image with the document", Pages: "all the pages" and Preview dimensions: "very big 1024x1024", but the software doesn't work: when I try to have a look at the documents with Adobe Bridge I can see a low res preview, while with ID Util (an utility for OSX Quick Look) I can't see any preview of the pages of the document. This issue didn't happen with the previous release of InDesign and my old MacPro with El Capitan. Now I'm working with a new iMacPro 3GHz Processor, Radeon Pro Vega 64 graphic card an OSX Mojave 10.14.2. InDesign release: CC2019 14.0.1 Italian language.
I've asked to a friend with another os (High Sierra) and InDesign 2017 to send to me a document with High Res preview image (1024x1024) and it works correctly with my iMacPro both with Bridge and ID Util.
I've also tried to uninstall and reinstall InDesign but nothing has changed.
And I've sent to a Dutch colleague a file saved with all the preferences images preview set as described above, and also he could not see the HiRes preview. So he opened my file with his English InDesign, saved it with the same preferences images preview and it worked correctly.
That's why I suppose there's a bug in the last Italian InDesign release under Mojave, or there is a problem in my iMacPro.