How to reshare externally in SharePoint post Box Migration
Follow these steps to share a document or folder externally for increased collaboration.
Step 1: Select the ellipses next to the file or folder that you want to share. Select Share.
Note: To share internally, you can select Copy Link and send the link to an internal user.
Step 2: Enter the email addresses of the intended recipients. Select Send.
Note: Select People you specify can edit to view link settings for tailored external sharing preferences. Select the preferred link settings and select Apply to complete the change in the link setting preferences.
Step 3: The recipient will receive an email granting the recipient access to the file. Now you and the recipient have access to the document to collaborate.