HI
Yes you can do all of that, although.
1) You can easily share attachments into SharePoint, either as an attachment to an item, OR into a Document Library. There are hundreds of examples of this.
--You would need a Triggered Flow for "When a response is submitted" forms action
----Then you grab the Attachment(s) and then use a loop to create them in SharePoint
2) Yes, you can setup another flow that will trigger any time your ticket status changes or the ticket remarks are.
You would use the when an item is created or update Trigger for SharePoint
--Add a Trigger Condition that checks if either of the fields you mentioned have changed, if NOT it won't trigger
----Then use the Send Email and you would have to use a Get Items, to pull back the original REcord in #1, so you can grab the email address to populate to To
-------In the body you can add whatever you want.
Done