Remote Image Widget
The Remote Image widget allows you to display an image from an outside source. This is great for linking to an image file on another website so long as the URL is publicly available.
Here's where you'll put in the URL of the image you'd like to reference. Be sure to paste in the entire URL including the protocol (that whole https:// thing). The image you're referencing for your channel needs to be on a secured domain, meaning it has to be within https and not just http.
Within your image size drop-down, you'll have a bunch of options to fine-tune how large you want your image in regards to the rest of the region.
With the cover region option selected, the image will be enlarged to the point until it completely fills over the region that it's in. It will do this while maintaining the aspect ratio of the image, so it won't appear squished or stretched. The size of the image will adjust to the point at which either the width or the height matches the larger of the two (the width or the height) of the region so that none of the background is visible. With this option, if the image isn't the same aspect ratio as the region it's in, it will crop part of the image to completely cover the region.
Use case example: This option is perfect for an image that has a central focal point and doesn't need the sides of the image to be visible in order to convey its message and meaning.
Contain within Region
With this option, the image will again retain it's aspect ratio, but it will instead adjust to the point at which the width or the height matches the smaller of the two (the width or the height) of the region so that some of the background is visible. With this option, if the image isn't the same aspect ration as the region it's in, the entire image will remain visible and the background of the slide will border around it.
Use case example: This option is primarily for images that have to be seen in its entirety in order to be meaningful. Images with a lot of text or a border for example.
Stretch to Fill
With this option, the image will not retain it's aspect ratio and will be stretched to fill the entire region and still show the entire image. Depending on how much difference there is between the size of the image and the size of the region, the image could look stretched, squished, or otherwise distorted when using this option.
Use case example: If an image is just a few pixels off from the size of the region and you need to view the entire image while also covering the entire region, stretch to fill is perfect. It's not recommended to use this option if the image is significantly smaller.