Linux Mint Virtual Box on Windows Access Shared Folder

First go to Devices -> Shared Folder -> Shared Folder Settings, Now click on the Add New Shared Folder + symbol button. Choose the directory and the folder name. Tick on Read only for safety and Auto Mount.

Screenshot:

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In the example above I am sharing my a folder named Downloads.

Shared Folder Setup:

Next go to home directory and create a folder of your choice. Ex: windowsdata. This folder windowsdata will be used to hold the windows shared folder data. Finally in that directory open terminal and write,

sudo mount -t vboxsf Downloads ~/windowsdata/

Now the Downloads folder data is available in windowsdata folder.