I appended 3 extra rows (named the source) to my main data set. I can see them in the Omniscope block (Data Manager). I cannot see the added data in the toolbar (with Devices) just the name of the source and 0 records. Why it doesn't show all data? Screen shoot of data manager is added.
Do you mean you can't see the data in your sidebar as filters? I can see that you have loaded the full data into Omniscope since the blue table view shows the additional 3 rows. Can you post your data file, or at least a screenshot showing where you are expecting to see the added data?
Unfortunately we don't fully understand the problem your encountering here. I think it might be beneficial to arrange a phone call/screensharing session so we can try and resolve this.