While Microsoft doesn't allow you to build a SharePoint Online document library using e-mail, there is a roundabout way of getting the job done using the tools that are included with Office 365 ...

Tips and best practices to help you successfully “roll up” content when you are using the Highlighted Content web part on modern SharePoint sites.

Now that you've created a shared mailbox and a SharePoint team site, Brien walks you through the steps of mail-enabling a document library using Microsoft's Power Automate tool in Office 365.