My group recently migrated from classic to New Google Sites. There were many things I was doing with classic sites and/or apps script's Sites Service I can't do
chamilo-lms
crypto.com-exchange-api
flax
object-hash
angular-translate
django-validation
django-tests
asyncfileupload
program-counter
semantics
laravel-cache
crossbar
default-initialization
obs
shoutem
tortoise-orm
pandas-apply
text-analytics-api
facebook-webhooks
function-templates-overloading
ffill
moodle-api
multibox
tween.js
wpf-positioning
multiple-matches
jmsserializerbundle
azure-stack
jackson-dataformat-csv
swirl