Hi I have upgraded to Big Sur just recently, current version. Parallels current versions of all tools and so on. I pressed update before verification. The problems described here did not happen on Catalina. I used Ubuntu 20.04 and Debian (current version) to verify this. I download a pdf from the web. It downloads fine. I open it on Linux, fine. I copy it to macOS. File format not recognised. Tried again. Same story. Created a new VM with Debian, same story. So I zipped the PDF and copied it to macOS, zip format not recognised I gzipped the PDF and then copied it to macOS: gzip format not recognised. No matter what format the file has, I copy from Linux to mac, they are not recognised. For Debian and Ubuntu. Have not tried windows yet. I have done this 100 times in the past without any issues. So it appears to me something in Big Sur has changed. But when will parallels reflect this?