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)