So, time to upload source code.
Note
App Inventor source code is imported and exported as ZIP (compressed archive) files. You do not have to (and should not) unzip them; all that is handled automatically.
1. Click on More Actions and then Upload Source.
2. Choose Browse in the dialog box that pops up.
3. Find the source code ZIP file on your computer.
4. Select the compressed source file, and click on OK to upload it.
It was quick (source files are small). The file uploads, is saved as a project in My Projects, and immediately opens on the Design application page.
It is, as I had hoped, a simple example of how to send an e-mail from an App Inventor app; something all will probably be doing. The Designer portion of the source code, as shown in the following screenshot, is basically two buttons and two textboxes. The Send to: button brings up our e-mail contact list, and the Send button sends the e-mail. The textboxes are for entering...