Unable to upload files with Flask on Heroku

Question

I\'m attempting to add a file addition button that uploads a file to a folder on my Flask Heroku app but I get an application error when I hit the submit button.

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Answer 1

Heroku is interrupting the request to store data at uploads/ because they prefer you use temporary storage at tmp/

Any tmp/ files will not be there when the dyno restarts because Heroku filesystems are ephemeral.

Following the 12-factor app principles, Heroku expects that if your app needs storage you'll use a storage service -- the popular solution is AWS S3 also available as an add-on.