After working on the images in Lightroom you need to export them out anywhere on the system, so that you can see the changes you performed on the images.
once you done exporting you can upload or send it via email or may be cloud.
Do you see the thumbnail as you have edited it? with your adjustments applied?
Then just right-click the thumbnail, select [Email Photo]. (Also available in the Export dialog)
If you can set up your email options for Lightroom to use, then there is no need to Export derivative files to the hard-drive. (unless you need to save the emailed images)