If you use "Native (Direct Paths)" in the Emby for Kodi add-on and the library's "Shared network folder" on the Ember server side has erroneous slashes in it, the add-on silently doesn't add the "smb://" prefix leading to unhelpful errors that don't help lead the user to fixing their error. I wonder if it might be possible to either validate the "Shared network folder" setting warning for duplicate slashes or mixed forward and backward slashes on the Emby server side and/or make the logic for when to prepend "smb://" less picky on the Kodi add-on side, such as just doing it for every path that starts with "\\".
In my case, I mistakenly entered a single forward slash later in the "Shared network folder" windows network path, e.g.: "\\server\share\foo/bar". Without anything pointing out the mix of slashes, it took me forever to finally notice them after many failed debugging sessions, especially since cutting and pasting the paths into Windows Explorer worked just fine. In another user's case, they mistakenly entered a trailing back slash in the "Shared network folder" resulting in a double back slash for the full path: https://emby.media/c...hs/#entry448373
Emby Server 184.108.40.206
Emby for Kodi add-on 3.0.11a
I apologize for the lack of a debug log file. All previous instances of the error messages have already been overwritten since I fixed the "Shared network folder" and done a "Repair local database (force update all content)" and my libraries are too large to do that twice as I'd have to do to reproduce the issue.