Hi there @RJacques.
Nothing has changed in this regard, so the older discussions are still accurate.
In summary:
If you’re asking about automatic syncing of changes–that is, your changes sync from device to device without you having to do anything other than giving them time to sync–then Dropbox is the only supported syncing service for iOS Scriv.
However, if you’re asking about you transferring copies of your entire project from device to device via a syncing service, then there are a few alternatives to Dropbox discussed in this thread, which you may have already read.
You may also be interested in looking through the articles in the iOS Scriv Knowledge Base, as well as the Cloud Syncing Knowledge Base.
Best,
Jim