Anyone who does some degree of customization should be able to upload CSS and JS files to embed into their page wrappers.
I'm relatively new to the platform, but as far as I can tell and from my team you need to create a page in pagebuilder and put your CSS in it - then link that page in your wrapper. Seems to me it would be much easier to add an option under the library tab for "source" files
Area of the Product | User Interface |
Hello, this exists. You have access to an FTP to upload files to. Contact support and they will be able to give you think information over the phone (for security reasons).
That being said when you embed CSS and JS in pagebuilder pages you have the ability to use Luminate S Tags and Conditionals within the code which gives you more flexibility and feature to use along with your CSS and JS. There are advantages and tradeoffs to both so you'll have to weigh which ones are more important for you.
Thanks,
Ken