Broken with "modern UI"

[hennott]

I´ve used this to add some UserCustomActions to my O365 and it worked fine. But when I use the modern UI the script isn´t loaded anymore. I´m not able to add a js-file to the modern UI.

[sympmarc]

@hennott: That's due to the "modern" UI, not @johnnliu's solution here. We simply can't inject JavaScript into modern pages yet.