New feature: Introducing a new file experience for groups in Outlook on the web

[Christophe Fiessinger]

Today, we've announced a new file experience for groups in Outlook on the web. People frequently rely on email to edit and share documents with their teams, and this new experience makes it easier to collaborate on documents in Outlook on the web. This feature is available to all First Release tenants.
Please try it out and give us feedback.

[#2]

You can't edit attachments from Files. Go to the document library and open the Email Attachments folder  and you can edit whatever files are there.

[#3]

Hi Shweta,
If you want to edit and reply to an attachment shared with the group, you will first need to open the attachment and from the preview you can perform "Edit and reply" action. You will not see an Edit and Reply option in the group files view.
Find out more about viewing and editing attachments in OWA(not specific to Group files view) here:
https://support.office.com/en-us/article/View-and-edit-an-attachment-in-Outlook-Web-App-E36B3369-514...