You can use Power Automate to automatically move email file attachments such as PDF or any other files type to a folder in OneDrive for Business.
How to save PDF email attachments to OneDrive for Business using Power Automate
How to save email attachments to OneDrive for Business using Power Automate
You can use Power Automate to automatically move your email attachments to a folder in OneDrive for Business.
Ellis Karim's Blog 