These are the steps to share files outside the company.
- At the top of the Documents library on your SharePoint site, click New, and then select Folder.
- Give the folder a name, and then click Create.
- Upload the files you want to share to the new library, or choose New to create new documents directly in the library.
- Select your new folder in the Documents library, and then click the Share button.
- In the Send Link window, click the list at the top, choose Specific people, select Allow editing, and then choose Apply.
- In the Send Link window, enter your customer's email address, type a message, and choose Send.
- Your customer will receive an email with a verification code, which they'll need to send to themselves to access your folder. If they can't find the email, they should check their Spam folder.