Loading the screenshot
Once we've saved the screenshot, head to the layout you want the share button on and add the event "System > On start of layout". Now add a sub event (right mouse click the event > add > sub event. Or press S with the event selected) "WebStorage > Local key exists" and name the key "Screenshot" (Or the same name you used for saving the screenshot). Now add a global variable with the name "ScreenshotLink" select the type as text and give it the initial value CanvasScreenshot. Then head back to the Local key exists event and add the action "System > Set value" and set the variable to "ScreenshotLink" and use the value "WebStorage.LocalValue("Screenshot")".