Google Drive, Dropbox etc shortcut in Activities missing in iOS 9

Since upgrading to iOS 9 (and installing the 9.1 update), the shortcuts to various cloud service apps I use such as Google Drive and Dropbox and OneDrive have disappeared from the Activities list, making it difficult to save email attachments, files sent over text/iMessage to a cloud drive.

For example, in iOS 8, if I opened an email attachment and clicked the share/upload icon (square with an arrow pointing up) I old see all the usual options such as Message, Mail etc but would also have the Google Drive, Dropbox etc icons available, allowing me to save directly in there.

In iOS 9, these options have disappeared. Anyone else noticed this? Any suggested solutions?

incidentally, there used to also be an option to save directly to Passbook (now Wallet) which has also gone but I note from my reading that that is a recognised and widespread problem with the upgrade that seems to be an Apple stuff up in the changeover to Wallet. Hopefully that gets fixed soon!