Yesterday, while I was writing a document using Libreoffice Writer, I deleted the tilde (~) file. I continued editing the document normally, and I saved it, apparently with no problems. Today, when I opened it, all I had was a blank page. I entered the Dropbox version history, and I found that, since I deleted the file that ended with the tilde, all the versions had the same problem. I tried photorec, looking for Libreoffice backup files, etc. Is there anything I can do to recover my document?