Please add an option to not show "Missing File" dialog (go on loading embedded data without asking) if data source's loading setting is set as "New data when possible" on Analyst, preferable a data table/data source level setting (Data canvas), an analysis level setting (File=>Document Properties), application level setting(Tools => Options) or environment level setting(Administration manager => perference).
The "Missing File" dialog is not shown on Web Player if option "New data when possible" is enabled.