Hello, thank you for getting back with me. To answer your questions, there really is not any way for me to tell which features were not added. I made a lot of very minor edits such as snapping, trimming, and extending features for connectivity. I do see some line features that were added in some areas but definitely see edits I performed not synced to ArcGIS Online. There really is nothing odd about any of the geometry as I have hosted several water systems to the online environment and have gone through all of the checks before publishing.
I am working with all feature types which includes points, lines, and polygons. I did a lot of attribute editing for all three of these feature types and from what I can see, most of the polygon attributes I updated have not been reflected after attempting to sync. My hosted data does use a lot of domains and actually did notice that some of those domains did not transfer over to the local copy. I thought that was odd but did not think anything of it. It seems like there are a few bugs to work through but perhaps I just am not doing it right. I can honestly say, I probably performed over 200 edits so I can't really tell which ones were synchronized and which ones were not.
Thank you for your help!