Can't upload custom CSS file to Style Library

Contributor

Hi.

 

I'd like to upload a custom CSS to SPO, so that we can brand our pages according to company policies. I'm using my Office 365 admin account to upload a CSS to our SPO style library, but when I try and upload the file, the upload get stuck here: 

 

kenneho_0-1589434151190.png

 

As desribed in https://docs.microsoft.com/en-us/sharepoint/allow-or-prevent-custom-script, I've run the Set-SPOsite https://ourtenant.sharepoint.com -DenyAddAndCustomizePages 0 command, waited 24 hours, but still it doesn't work. 

Does anyone know what may be causing the upload to be stuck like this? I've read that other people get some kind of permissing denied, which is resolved by running the above mentioned command, but it seems that this is not the issue for me. 

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