If there are problems with shared folders or other guest operations, an important step is being missed. For this, the extension called Guest Additions must be added to the guest machine.
For example, the shared folders feature is intended to be used to send files from a Linux host machine to a Windows guest virtual machine;
- Start the virtual machine
- in the top tab of the window that opens, find the Devices option
- Select Insert Guest Addditions CD image... option
- then run the Guest Additions installation wizard from the file manager of the windows virtual machine and install it.
If step 3 says Guest Additions not found should I download this from the internet, press this. But if you think you are having problems with the download, you will need to download this .iso file manually from the internet.
- Download the Guest Additions iso from the internet
- and again
Devices > Optical Drives > Choose Disk File... > Select Guest Additions iso file - then run the Guest Additions installation wizard from the file manager of the windows virtual machine and install it.
Reboot after the installation process and the previously set shared folders will appear in the file manager of the windows virtual machine.