Hi @Gerald_T
You could do something like the following:
1) Get response details
2) Get information about the attached file in forms. This information is in JSON format, so you could parse it using this schema:
{
"type": "array",
"items": {
"type": "object",
"properties": {
"name": {
"type": "string"
},
"link": {
"type": "string"
},
"id": {
"type": "string"
},
"type": {},
"size": {
"type": "integer"
},
"referenceId": {
"type": "string"
},
"driveId": {
"type": "string"
},
"status": {
"type": "integer"
},
"uploadSessionUrl": {}
},
"required": [
"name",
"link",
"id",
"type",
"size",
"referenceId",
"driveId",
"status",
"uploadSessionUrl"
]
}
}
3) Build the path where the file will be stored -> /Apps/Microsoft Forms/<Name_of_Form>/Questions/<Name_of_File>
4) Get the file content using path in Onedrive.
5) Send the email to the user.

As there could be multiple files (although we know there's only one), Power Automate adds the "apply to each" action.
Hope that helps!
Ferran