That is correct, though it would be simpler to use the pronoun it.
Please find herewith enclosed the file
Either version is correct.
Enclosed, please find my final remittance.
enclosed herewith please find the invoices for your reference
No.
It is often used: Please find enclosed several documents, as per requested. (Though per can be omitted - letters enclosed as requested, etc.)
Please find enclosed my application for the position available.
as per trailing mail please find enclosed the file
Obama understands that personal problems can make it difficult to focus in school
he had to stay in bed for the previos days
Please detach the bottom section and return with your remittance in the enclosed envelope.
you don't, when you surrender the checkbook get a receipt, otherwise if you mail it, do it registered with receipt and do it easy: quote Name, address, date to ..... Bank Address Att: ......Manager re: Surrender Checkbook Account # Dear ladies and gentlemen; Please find enclosed the checkbooks for account #...... Kind regards ...... enclosed: checkbook checks number ...... to ...... for account # unquote Please find enclosed