Thanks for posting.
Is this file hosted through FileMaker Pro or are you accessing it directly on the device?
The Save a Copy as command isn't available to hosted files but this should work if the file's being accessed directly on the device.
Looking at your script, you may need to add another a step just before the Save a Copy as statement.
Set Variable[$Path; Value:Get(DocumentsPath) & $PropertNo]
And then edit your Save a Copy as step to look like this:
Save a Copy as["$Path"; Create email; copy]