what WordPress/site files normally go into the S3 bucket in order to get optimal use as a CDN?
Normally the defaults should suffice i.e.,
You’d want to check these options under the “General” section:
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Host attachments
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Host wp-includes/ files
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Host theme files
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Host minified CSS and JS files
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Host custom files
And under “Advanced” section:
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Modify “Theme file types to upload” to something like this:
*.css;*.js;*.gif;*.png;*.jpg;*.ico;*.ttf;*.otf,*.woff,*.eot,*.svg
That should do it.