Can't edit or annotate pdf in iOS 12 Files app on iPad with third party drive
I'm using a 2018 iPad, before updating to iOS 12, I can edit, annotate and draw directly on any pdf files in the files app with google drive or one drive, now in iOS 12, I can't edit any files, the edit icon just disappeared.
The iPad above is running ios 12, below is running ios 11, these are the same file from google drive opened in the native files app.
Is there a way to solve this? Thanks!
iPad Wi-Fi, iOS 12.1, iPad 6th gen