Question

Where does Flask store uploaded files before the application code has a chance to save the file? Unless I’ve missed something it doesn’t appear to be showing up in the /tmp directory, which is what I’d have expected, and obviously it’s not showing up in the directory I’ve specified in app.config['UPLOAD_DIRECTORY']. It’s not storing it in memory, is it?

Answer 1

Did you check the documentation? It seems pretty clear:

So how exactly does Flask handle uploads? Well it will store them in the webserver’s memory if the files are reasonable small otherwise in a temporary location (as returned by tempfile.gettempdir())