I have been having this problem for a long time now... and it happens occasionally, possibly 2 or 3 times a week at random. Whenever I save a LO file in a cloud provider (I use pCloud and OneDrive), the files end up with 0 bytes. Apparently at first they're saved as expected, but then some synchronization issue happens and brings the file to 0 bytes. Then I have to go to the online cloud and download the file again to restore it. This has happened for a long time now and apparently it affects various users. https://ask.libreoffice.org/t/suddenly-some-odt-files-are-0-kb/86442 https://ask.libreoffice.org/t/content-of-my-document-has-disappeared/90786 https://ask.libreoffice.org/t/libreoffice-base-file-became-0-bytes-after-last-edit/109261 I have never had this issue with other applications... only LO files cause this issue to me.