Create Sprite from Image In Unity
Covert an Image to Sprite in Unity to use it where sprites are required.
Drag an image from folder explorer to assets.
Select the image in the Asset, texture Type: Sprite (2D and UI)
Select Sprite Mode: Single
Then you can use the sprite in different places in Unity, such as the UI.
Right-click in the Hierarchy, UI, Image. Select the sprite as a sprite source.