/blogname/files/ = 404

Can you share the real URLs?

Sure.

https://www.sneakersbr.com.br/schlaepfer/2011/07/04/darwin-deez-circo-voador/
the first file missing is the custom header for each blog. that is having the same problem.

One example:
https://www.sneakersbr.com.br/schlaepfer/files/2011/07/darwindeez_01.jpg
should be redirected to
https://www.sneakersbr.com.br/wp-content/blogs.dir/15/files/2011/07/darwindeez_01.jpg

https://www.sneakersbr.com.br/schlaepfer/files/2011/07/darwindeez_01.jpg is blank, not a 404, which is a slightly different error.

https://www.sneakersbr.com.br/wp-includes/ms-files.php?file=2011/07/darwindeez_01.jpg (which is what the above URL parses to) is a 404.

First, make sure you HAVE the wp-includes/ms-files.php file.

Hmm I see.
But I just checked and the file is there.

Okay, what’s in your .htaccess?

Just some basic stuff. Somethings from WP Total Cache and the first lines are from wordpress multisite.

https://pastebin.com/raw.php?i=2uQN8Gky

And I’ve tried with just the wordpress code and it didn’t work.

Unrelated… You should have the WP cache stuff BEFORE the WordPress code. WP’s default .htaccess should be at the bottom, for efficiency’s sake.

Did you try re-applying the 3.1.4 upgrade? Just in case some files didn’t copy up cleanly?

do you have an actual domain.com/files/ folder on the server?

To be honest I’m a little afraid of upgrading again.

@andrea_r no. There is no folder.

UPDATE!
Just updated to 3.2, purged all the cache and it’s still happening.

Check what versions of PHP you’re using, and ask your host if they upgraded anything?

There’s no reason this should have changed with WP upgrade.

I’m using PHP 5.2.17 and it’s been like that for sometime.

in theory, I should be able to just go to /blogname/files/file.jpg to see a file under /blogs.dir/XX/file.jpg but instead it’s returning me a 404

Actually, I think we’re trying to troubleshoot something that’s always worked this way.

In theory, yes – if it were a physical folder you’d be able to see the file tree and work your way down, but … it’s not.

Going to any recent version of multisite to subsite.domain.com/files/ will give a 404.

Damn! I really don’t know what to do.

Andrea, yes but…

https://www.sneakersbr.com.br/schlaepfer/files/2011/07/darwindeez_01.jpg is blank

And https://www.sneakersbr.com.br/wp-includes/ms-files.php?file=2011/07/darwindeez_01.jpg is a 404.

And both should point to https://www.sneakersbr.com.br/wp-content/blogs.dir/15/files/2011/07/darwindeez_01.jpg which does work.