1) Attach a file already in the cloud (visible through Remote File Explorer) to an email
a) In the new email window, click the paper clip icon to attach a file
b) Find the file, select it, and click Ok to attach
2) Attach a file from your local computer
a) Follow the instructions in step 3 to move the file to the cloud first, then attach, OR
b) Right-click & copy the file from your local computer
c) Then Right-click & Paste the file into the body of the new email
i) This will automatically upload and attach the file without transferring it first
ii) Note, if this is a large file, be patient as the upload may take a few minutes (depending on your connection)