Action users number confusion I created previously 2 actions (animations) of my model, which I use in Unity. They both have visible number "3" near the "F" letter button, which I click that action would be saved. When I am adding now new actions and clicking "F" button it always appear "visible users number" not as "3" but as "2". These actions, which have "2" instead of "3" are not visible when I importing them to Unity.

Is there possible to change this "visible users number" that my new actions would be the same as these ones, which have "3" buttons instead of "2"?
The number shown is called a user count. A user being defined as a data block (or object) in blender.

A new action will have one user, adding a fake user by clicking the 'F' button makes it 2 users, to get a third user you need to link it somewhere else, like to another object, a strip within the nla editor or an action constraint.

By dulicating an object with AltD (known as a linked copy) the new object will also be linked to the action. If this is the case then you may be importing the duplicate into unity not the one you added the new action to.