Hi @GeeteshSingh07
<dsID> can be found when you make a selection in the app at run time. Say you have an app that has a table in it. When you select a row in the table, you will be able to see the ?data_id=<dsID>:<selectedrecordID> appearing in your URL:
In the example above, 'dataSource_2-2' is the data source ID, '%3A' is the encoded value of the colon, and '2 ' is the objectID of the selected record.
Any selections you make in the app will lead to adding the data_id in the URL - it does not have to be a selection in the table. However please note that URL parameters are added in preview and run time, but not in the builder.
Please let me know if you have any further questions!
Shen Zhang