consider supporting other cloud storage besides Dropbox & OneDrive
I use a number of machines and have loved the ability to directly edit OPML files in a Dropbox folder on Linux or MacOS, and have them synced automagically with Outliner on my iOS devices. But Dropbox is becoming much less friendly; now I'm limited to only three devices, unless I pay a high price for a premium account. Any chance you could support syncing via Box, Mega, Google Drive, etc? Something Linux-friendly would be ideal.
John Cronin commented
I use Google drive and love carbonfin; I won't use Microsoft or DropBox