On this topic of using OmniOutliner with DEVONthink on iOS, I can share what I do. I’ve long experienced the same problem that OO files end up as “unknown” on iOS, but then one day I discovered you can do this:
- go into OmniOutliner on iOS
- use the “Browse” function in OO (tap the Browse icon along the bottom row)
- select “on my iPhone” or “on my iPad” from the list it shows
- tap the “…” icon in the upper right of the screen
- select “edit” from the menu
- look for DEVONthink To Go in the list
- enable it
- click done in the upper right of the screen
Now you will have DEVONthink To Go in the list of Locations you can browse in OmniOutliner. You can browse the group structure of your DEVONthink databases directly from OO – they are mapped to folders in the iOS device file system. OmniOutliner naturally recognizes OO files, so they are easy to identify among the lists of documents (and of course you can tap them to edit them in OO directly).