Gray, inaccessible iCloud Drive files.
Have copied one Excel (.xlsx) and several Word (.docx) and Portable Document Format (.pdf) files to iCloud Drive to share between my Mac & PC.
Oddly, on the Mac side, in the iCloud Drive Finder folder, every file type other than Excel is gray.
Subsequently, on the PC, the iCloud for Windows iCloud Drive only shows the Excel file.
Having never encountered this behavior, I'm not certain how to write a decent knowledge base search?
Mac mini, Mac OS X (10.6.8)