Before we start reviewing how to share files with external users I want to show you how TCC has configured “OneDrive for Business” for the district.
Below are the settings for sharing with external users from “OneDrive for Business.”
We will start our review on how to share files with external users.
I am going to present the most restrictive form of document sharing.
Open “OneDrive for Business” https://onedrive.live.com/about/en-us/signin/
Enter your TCC email address click “Next” then enter your Network “password.”
You will receive a prompt for "Multifactor Authentication."
Highlight the document that you want to share. Click the “ellipsis” then Click “Share”
Note: If sending to someone outside of TCC click the > arrow then Choose “Specific People.”
Click “Other Settings” - Choose the permissions for the document. I chose “Can Review.”
To send to an external email address we chose ”Specific People.”
We are allowing “Can View” no editing of the document allowed.
We chose to “Block Download” of the document that the recipient is only allowed to “View.”
Click “Apply.”
Enter the recipient's email address.
The icon shown below indicates the recipient has “View Only” file permissions.
Enter a message indicating what you are sending. You have a 500 character limit.
Message Example:
“This link will open a document named “Storms.” You have “View Only” permissions and cannot share the link with others.
If this is not a Microsoft email address you will be prompted to request a “Security Code” and one will be sent to the email address used.
Thank you, Pam.Used2Document
Click “Send’”
The sender will see the following email in their Outlook “Sent Items.”
The recipient receives the email with the shared document.
The recipient opens the email then clicks “Open.”
The recipient may receive the following message when they click “Open” they should click “Proceed.”
The next screen appears for the recipient to request a “Verification Code” - they Click “Send Code.” The recipient will receive an email containing the code to enter then “Verify.”
The recipient will be emailed a “Verification Code.”
When the recipient opens the email they will see the verification code that they will enter
Enter the “Verification Code” and then click “Verify.” 
The document opens.
In the upper left corner, the following message appears:
”You don’t have permission to download or print this file.”
File Permissions -Brief overview
This is the file that we shared with an external user.
When you click the document “ellipsis” you will see the choices for “managing” your document. 
Choosing “Manage” allows you to assign a variety of permissions to a shared file.
Microsoft Support Article