Hi @AdrienG
You could do the following:
1) Get response from Form
2) Get the File field (in this case, "File Sample").
3) When working with files in Forms, that field contains the following structure:
{
"name":"myfile.pdf",
"link":"https://sharepoint-sample/docs/myfile.pdf",
"id":"01IOE32TELKGDEGANHJZBA42AUDNIZS3ZFBZ",
"type":null,
"size":20001,
"referenceId":"01IOE32TCEYXCTVFS45FFZGP5IVDMLOT",
"driveId":"b!QTMueTja_k452k3_vBTJfwjXbAQwF55pJsTtP04BxRXgwQCCs0gM1RKjfJFDAuMwJ",
"status":1,
"uploadSessionUrl":null
}
4) Therefore we get the file content in OneDrive (files are stored in the OneDrive of the user who created the form).
5) After that, we can send an email, with an attachment with the same name of the file and its content:

Hope it helps!
Ferran