If you'd like to create a Vertical Video from a photo, select the Publishing Tools icon from the left rail and select Video Studio. Then, select "Upload Media." You can either upload a file from your computer, or input the image URL.
Once the image is loaded, you can make adjustments. Click on the "Background" menu at the top to adjust the background color or opacity of the image. You can also add in a text box by clicking the plus icon in the top right.
When using pictures within Video Studio, it's recommended to use 9:16 aspect ratio. The required aspect ratio is between 0.01:1 and 10:1.