Click the Upload button and select a presentation file (PPTX, POTX, PPTM, and POTM). Once you upload the file, modify the following theme settings:

• Color scheme: A set of accent colors.
• Font family: The typeface used by text content.
• Background fill style: Solid or gradient.
• Background accent color: A color from the color scheme collection.

Click Download Presentation to apply changes and download the resulting presentation file in PPTX format.