Have you got the latest version of Dropbox? I know there were some bugs, which got fixed in later versions. It definitely works with Dropbox on my iOS 11 device.
As for Google Drive saving, I had the same, I think it is a bug in Google Drive, all the operation finishes successfully on our end. I tried that on iOS 11 device, so on a fairly recent system. I could not get it to install on my iOS 10 device. When I do the same on Android, then it correctly uploads the file to the drive.
As for reading, where are you reading from?
No worries with the news, it’s much better to hear about them now than after the release to the master branch