Use this article to learn about colors in Animate
Use the color panel to modify the color palette of a FLA and change the color of strokes and fills, including the following:
Use the Swatches panel to import, export, delete, and modify the color palette for a FLA file. The swatches and color themes available in the Color panel are read-only. You can use a swatch or theme in your artwork, directly from the Color panel. However, to modify a swatch or color theme, first add them to the Swatches panel.
To know more about Swatches in Animate, read the article on Color panel.