Hi,
1. This is possible, You can use a Condition to check and see if the email has attachments and then use 'Get Attachment' inside an 'Apply to each' to get the Name or the ID of all the attachments. Once that is done you can then check with another condition to see if the name criteria is met. If yes then you can trigger your other flow to run.
2. It will be easier to save the file to onedrive or sharepoint, and as for N number of attachments you will be able to go through each attachment with an 'Apply to each'.
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