There are no layout choices. There is no limit on the media you can put in a page.
Images
Choose image opens your library. You can also drag a file onto the page. Every image takes alt text, which screen readers announce and search engines read, and an optional caption.
Click a placed image to open its details. Replace it, change the caption or alt text, or turn on zoom so a reader can open it full size. Zoom is useful for screenshots.
Card image is separate. It is the image shown when the page is shared in a message or a link preview.
Video
Paste a YouTube or Vimeo address, or upload a file. Embedded video loads from the no-cookie domain, so it sets no tracking cookies on your readers.
A two-minute video of how you would approach someone's problem is worth more than most things you can put on a site.
Audio
Paste an address or upload a file, and give it a title.
What you cannot do
Put things side by side, wrap text around an image, or set a width. Media sits in the flow of the page at one size.