Share iCloud Drive files and folders in iCloud for Windows
With iCloud for Windows, you can share files and folders directly from File Explorer. If a file or folder is shared, you see 
next to the filename if you shared the item or 
if someone shared the item with you. See a list of icons and what they mean.
Note: This feature isn’t supported in iCloud for Windows version 7.
Share files and folders from File Explorer
On your Windows computer, open File Explorer, then click iCloud Drive in the Navigation pane.
Right-click the file or folder you want to share, choose Share with iCloud Drive, then choose “Share a link.”
Click Add, then add the email addresses or phone numbers of your participants below Participants.
Below Sharing Options, choose who can access the file or folder.
Click Apply.
When you share a folder, only the participants can access the files in the shared folder. To invite more people to access the files, you must change the settings of the shared folder. You can’t select an individual file or folder within the shared folder and add participants to it.
Manage participants or sharing options
The owner or co-owner of a file or folder can manage participants and sharing options.
Co-owners can add or remove participants and change their roles, but only the owner can stop sharing entirely.
Note: You can’t change the sharing settings for an individual document in a shared folder. You must change the settings of the folder.
On your Windows computer, open File Explorer, then click iCloud Drive in the Navigation pane.
Right-click the shared file or folder, choose Share with iCloud Drive, then choose Manage Shared File or Manage Shared Folder.
Do any of the following:
Add a participant: Click “Add participant,” then enter the participant’s email address.
Remove a participant: Right-click a participant’s name, then choose “Remove participant.”
Change a participant’s role: Right-click a participant's name, then choose “Co-owner,” “Can edit,” or “Can view and download.”
Edit sharing options: Below Sharing Options, choose who can access the file or folder.
Click Apply.
Remove yourself from a shared file or folder
If you’re a participant, you can remove yourself from a shared file or folder.
On your Windows computer, open File Explorer, then click iCloud Drive in the Navigation pane.
Right-click the shared file or folder, choose Share with iCloud Drive, then choose Manage Shared File or Manage Shared Folder.
Click “Leave share.”
Stop sharing files or folders
You must be the owner of the file or folder to stop sharing it.
On your Windows computer, open File Explorer, then click iCloud Drive in the Navigation pane.
Right-click the shared file or folder, choose Share with iCloud Drive, then choose Manage Shared File or Manage Shared Folder.
Do any of the following:
Stop sharing with all participants: Click Stop Sharing, then click Yes.
Stop sharing with just one participant: Right-click the participant you want to remove, choose “Remove participant,” then click Apply.
If you stop sharing or delete a shared folder, the participants can no longer view or edit the files in the folder.