I just added the pdfs, and let mendeley to copy them to the library and rename using the author name, year, and title yesterday. Then today, the links to the pdf files are missing. I can not open most files by cliking on the title in the list. I noticed that there are spaces and non-English characters in the filenames. The software keeps printing the following informaiton to my terminal:
QString::arg: Argument missing: Copying updated library files