Ruby on Rails app on Heroku file upload not working - ruby-on-rails

I'm new to Rails and Heroku as well.
Following tutorials I succeed to upload my app to Heroku.
My app is enable us to upload csv file to uploads folder in public.
So I can upload file in heroku deployed app and show table as I want.
But after 30 mins or so those files are removed automatically and showing error that no such file in public/uploads folder.
It is properly working on my local which is using sqlite3.
But heroku want to use psql for production mode so I changed production mode to use psql.
So if I upload csv file then it is stored in 'public/uploads' folder.
I think heroku app is automatically update to github repo even I didn't execute 'git push heroku master' command.
In my local repository files are stored but they are run on development mode.
How can I make upload functionality fully working?
Any help would be appreciate.

Ephemeral filesystem is just the way heroku works, as explained in the article - uploaded files will be removed when the instance is restarted.
What you should do is to upload those files for example to S3 (https://devcenter.heroku.com/articles/s3), you can achieve this with CarrierWave gem with Fog gem but there are other possibilities as explained in this thread here: https://www.reddit.com/r/rails/comments/2k9sq4/heroku_any_files_you_upload_will_not_be_saved/

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Check this answer: Store file in directory tmp on heroku Rails
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