The cost ($10) of paid version of GmailUtil extension is paid yearly or one time?
You may want @Andres_Cotes about that specifically. Generally I think most paid extensions are one-time payment.
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Paid one time
Different eMail solutions for App Inventor
Taifun
Trying to push the limits! Snippets, Tutorials and Extensions from Pura Vida Apps by 
Taifun.
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If i pay 10 USD for GmailUtil extension will it facilitate me to attach saved text file into my mobiles internal memory?