After adding an element from a local directory in the Eclipse UI 18.1.7, the file has the 'Unknown status' decorator in the local file directory.
Release : 18.1
Component : ENDEVOR ECLIPSE PLUGIN 18.1.7
The unknown status only occurs for addling elements to Eclipse UI using Binary format type definition. Eclipse plugin does not read binary files to count the hash and therefore cannot establish relationship with the remote element.
Binary types are meant for the executable (non-readable) files, and not for ASCII files. User should choose txt format type definition for ASCII file.
For this particular scenario (add elements using Binary format type definition), there is manual "Update Element Statuses" action in Eclipse plugin to clear the unknown status.