In Power Automate you can set up a flow to monitor your inbox and automatically save attachments that have been emailed to you. This post will show you how to create this flow and have the attachments (excluding email signatures) saved to a SharePoint folder.
When using the Outlook Power Automate trigger, When a new email arrives, you can apply a filter based on the email subject. Rather than just a single string as your Subject Filter, you may want to apply a filter that will work on multiple different words. The advanced settings for the trigger allow you to set these conditions.