Why, on page 56 of the DEVONthink for macOS manual, does it say, “DEVONthink To Go does not support indexed items”?
I have a database which I exclusively use for indexed items, and it appears to sync to and from DEVONthink on macOS and DEVONthink To Go perfectly well (via a Dropbox sync store).
I can create/edit files in that database in macOS and they (or the edits) appear in DEVONthink To Go (as well as in the Finder).
I can also edit those items and/or create new ones in DEVONthink To Go and they will sync to the macOS database (and the Finder).
So what is supposed to be “not supported”?