Hi there.
No, it’s not possible to add the file directly to Airtable by using their API. Their API requires only a URL if I’m not mistaken.
So, you can create an easy workaround in Make. Just upload the generated file to some cloud storage (Gdrive, Dropbox…). For both options, Make has a module that can create a “share link” which you can map to Airtable.
Cheers,