Submit Button Issue Cannot Send using MailAPP

Hi @letty_0517, 

On desktop systems like Windows, a PDF form’s Submit button can launch the default mail client (e.g., Outlook) and attach the form directly. However, on iPadOS this works differently.

iPads run apps in a sandboxed environment, which means one app cannot directly launch another with a file attached unless the developer has built that specific integration. 

Cannot send using mailapp

This is an iPad/iPadOS limitation, not specifically a PDF Reader bug.

Workarounds:

• Save the completed form and use your PDF app’s Share or Send a Copy feature to select Outlook or another mail app manually.

• Use Adobe Acrobat for iOS/iPadOS, which supports broader sharing options.

• If possible, adjust the form to submit to a server rather than rely on local email submission.

This should let you send the form successfully from the iPad, even without the built-in Mail app configured.