This provides instructions on how to insert SharePoint/OneDrive Links into Outlook Emails on a Mac.
- Click "New Message."
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Select “Insert Link.”

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From the dropdown menu presented, select Insert Browse Cloud Locations.

You are then presented with an option to select from a SharePoint site (via Sites) or from your OneDrive folders in the cloud.

If you select Sites, you see all sites to which you have access:

If you are missing the "Insert Link" button in Outlook, please follow these instructions to add the button to your toolbar:
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Open New Message.
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Select three dots and then “Customize Toolbar.”

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Drag “Insert Link” into top bar.

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If you leave the default options and only drag in “Insert Link,” it should look like this before you select Done.

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Select Done.
For additional information, please visit Microsoft - Shareable links in Outlook.