Sure, here is a step-by-step guide to add a scrollbar to a TextMeshPro input field in Unity:

Make sure you have installed TextMeshPro package in Unity. You can do this by going to Window > Package Manager and search for "TextMeshPro".

Create a new canvas in your scene. You can do this by right-clicking in the hierarchy and selecting "UI" > "Canvas".

Add a "Scrollbar" component to the canvas. You can do this by right-clicking in the hierarchy, selecting "UI" > "Scrollbar".

Create a new "Input Field" component by right-clicking in the hierarchy, selecting "UI" > "Input Field".

In the Input Field component, select the Text component and change its font to a TextMeshPro font by clicking on the "Font Asset" dropdown and selecting a TextMeshPro font.

In the Input Field component, click on the "Content Type" dropdown and select "Standard". This will allow the Input Field to handle scrolling.

Set the "Vertical Overflow" option in the Input Field component to "Scroll".

In the Scrollbar component, make sure the "Direction" option is set to "Bottom To Top".

In the Scrollbar component, drag the "Handle Rect" component to the Input Field component. This will link the Input Field to the Scrollbar so that the Input Field can be scrolled with the scrollbar.

Play the scene to test the scrollbar functionality. The Input Field should now have a scrollbar that can be used to scroll the text within it.

Note: This is a basic example, you can customize it to your specific needs.
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