I am using ms graph api to get all the messages with attachments. Over this I need to get the files having docx/pdf extensions. Below are the filters I have tried.
https://graph.microsoft.com/v1.0/me/messages?$filter=hasAttachments eq true and ext eq 'docx'
https://graph.microsoft.com/v1.0/me/messages?$filter=hasAttachments eq true and extensions eq 'docx'
You'll need to do this using multiple API calls. First you need to retrieve a list of messages with attachments (has Attachments) and then you need to iterate over the resulting ids in order to retrieve the attachment metadata.
For example, the call returns a list of message ids that have attachments:
https://graph.microsoft.com/v1.0/me/messages?$filter=hasAttachments eq true&$select=id
For each of the IDs we got back, we then make a second call to get the attachments:
https://graph.microsoft.com/v1.0/me/messages/{message id}/attachments
From these results you can inspect the Attachment's name property to determine what the file extension is.
