The quick answer

Mac screenshot keys only grab what is on the screen. They do not save a whole chat, page, or long list.

A web browser may save a full web page. For other Mac apps, use a scrolling screenshot app.

Pick the best way

WayGood forThe catch
Your web browserA normal web pageIt may not work inside other apps
Many screenshotsA short pageYou must join or share each image
A scrolling screenshot appChats, docs, code, and appsIt needs screen access on your Mac

Use GifJot

  1. Choose Scrolling Area

    Open GifJot and pick Scrolling Area.

  2. Pick the area

    Draw a box around the part that scrolls.

  3. Let GifJot scroll

    GifJot moves down the page and joins each part.

  4. Use the PNG

    GifJot saves one long PNG on your Mac.

PNG or GIF?

Use a long PNG when people need to read the page. Use a GIF when they need to see what moved.

Sources