Hi again, sorry for my delayed response. I've a simple example:
I look for any album and add it to a new collection, in this case I have called it "test". Then I open the collection "test", open the menu and finally pulse in the option "sync".
The job result is "failed" with 0 items. Attached screenshots with all the steps.
2018-04-29 03:04:58.032 Info HttpServer: HTTP POST http://x.x.x.x:8096/emby/Sync/Jobs. UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.183 Safari/537.36 Vivaldi/1.96.1147.32
2018-04-29 03:04:58.033 Debug BaseItem: Query requires post-filtering due to LinkedChildren. Type: BoxSet
2018-04-29 03:04:58.047 Debug BaseItem: Query requires post-filtering due to LinkedChildren. Type: BoxSet
2018-04-29 03:04:58.056 Info HttpServer: HTTP Response 200 to y.y.y.y. Time: 24ms. http://x.x.x.x:8096/emby/Sync/Jobs