How do I upload file to a specific email?

How to upload file to a specific email using app inventor to develop android and ios app¿

Some of Taifun's suggestions https://puravidaapps.com/sendmail.php might work on both Android and iOS. Be aware, ActivityStarter 'solutions' currently are not available on ios so far as are email solutions using extensions.

Is it a gmail account ? Do you want to send it from this specific email or to this specific email ?

Yes it gmail account

send to that gmail account or send from that gmail account ?