Can't make it work in heroku

[eibrahim]

It's working locally but can't make it work in heroku. upload button doesn't show up.

I tried config.assets.initialize_on_precompile = true and config.assets.initialize_on_precompile = false

I have all the AWS settings correct (it works locally).

I enabled the heroku lab feature with heroku labs:enable user-env-compile -a myapp

Can you help please? Thanks.

[eibrahim]

BTW, I am using rails 4 and ruby 2

[walidvb]

I have it working on one of my heroku instance, with neither config.assets.initialize_on_precompile = true or the lab enabled, but my other instance won't show the button either..