Distribution sets are among the main prerequisites to send a software update to your device fleet..
Create a distribution set
To create a new distribution set:
Navigate to Distribution sets on the left sidebar.
Select List from the sub-navigation (selected by default).
Click the + icon in the top right area.
This will open the Add distribution set dialog where you should provide the following information:
Type - a mandatory field - from the drop-down select one of the existing types - OS only, OS with app(s), App(s) only. You may also select any custom types that have already been created via the Management UI (Classic).
Name - a mandatory field - the name of the new distribution set.
Version - a mandatory field - the version of the new distribution set.
Description - an optional field - any description that may help you identify better the distribution set later on.
Migration step is required toggle - this is important in case multiple distribution sets are assigned to the same target. If the toggle is activated, the older assignment will finish and this will be the trigger (or migration step) for the new assignment to start. If the toggle is not activated, the newer assignment will cancel the older one. See also Distribution view.
Once ready, confirm with Add.
You will then see the new distribution set as part of your Distribution sets view.