When you open an image editor it has features like adding your gallery images on the image editor for editing. But sometimes you want to add images found on google images and edit those, so steps will be to download it then use that. But if you have the url of the image you can just use this app when it asks you where to get images from usually with "Gallery" "File Explorer" "Open From Url" you choose this and paste the link and you don't have to save the initial file on your downloads folder. - If you don't understand this please ignore this app.
Open From Url is an app that lets you choose to get any files from internet with a link. So if you have an image from internet that you want to edit, you can copy the link and paste it in the textbox when you choose Open From Url as your Browse Gallery.