The Rails application is not working in the production environment, so-called production environment.

Of course, I think I have already checked it, but

config.assets.css_compressor=:ass
config.assets.enabled = true
config.assets.compile=true

<Application Route Directory>/config/environments/production.rb
Configured in and

$touch<Application Route Directory >/tmp/restart.txt

Why don't you delete the contents of tmp/cache and restart the web server?When it still doesn't work

 rake assemblies:precompile

When I try things like that, I feel that they work well.
I think I've already done it, but I remember that the browser cache was erased so that it wouldn't be confusing, and the display would be updated if I accessed it several times until the update was reflected.
I'm sorry that I didn't know exactly how it works around here, so I only answered from experience, but I hope I can be of help.
Most browsers have the ability to read the source, so it would be easier to view the source and check the file contents of the CSS file in the head tag (link tag).

How about taking resources to S3 using AssetSync?

Setting the bucket policy properly should help isolate the problem.

I rm the public/assets once and precompile again and got css.
I have tried many things, but I think there is a json file called .sprockets-manifest under public/assets, and I am managing the version of the precompile file, but I think it was because it was old.
So I deleted everything and tried again.I would appreciate it if you could help me.