With the 5.3 WordPress update, a new way of saving additional image sizes to the database was introduced for when images are uploaded to the library. Unfortunately, this adjustment was not compatible with the internal naming convention for Avada’s custom image sizes.
The problem will only occur for images that are uploaded to WordPress 5.3 and versions of Avada prior to 6.1.2. For these images, Avada’s custom uncropped image sizes are not available as a choice in the sizes drop-down option in the media library when you insert them to a post or page. And some of the responsive image sizes won’t be available. Updating to Avada 6.1.2 resolves this issue.