In some instances, users on Windows 10 may be unable to email photos or other media from within Mylio. You may receive an error message “No default mail client”, or similar.
This issue is caused by Windows 10 being unable to use the built-in Mail client as a default mail application. This is a known Windows issue and not solvable by Mylio.
In these cases, the best solution would be to export the image and mail it or set a different default email client such as Outlook or many other third-party options.