You could save your email attachments into a SharePoint document library through Power Automate template. In this flow template, you should fill in the Folder in the On new email with attachment action, Site Address and Folder Path in the Create file action.
References:
https://www.c-sharpcorner.com/article/ms-flow-to-save-email-attachments-to-sharepoint-library/
https://www.c-sharpcorner.com/blogs/how-save-my-email-attachments-to-a-sharepoint-document-library-using-ms-flow
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