Adding and replacing images
Swap a photo on a page without stretching or slowing the site.
Make the image the right size first
Photos straight from a phone are far too big. Aim for about 2000 pixels wide and under 500 KB.
Select the image block and click Replace
Choose Upload, pick your file, then add a short description in the Alt text box.
Update the page
Click Update and check the page on your phone as well as your computer.