You can fill out forms and sign documents that you receive on your iPad. After you complete a form, you can add your signature and share it with others. You can also use AutoFill to quickly fill out forms with information you saved in the Contacts app. In supported apps, you can use Markup to add your signature to a document or create multiple signatures to use in different images and documents.
Go to the file you want to open.
Tap the file to open the document.
If prompted, open the document in the Files app, then tap Save.
Tap Add email attachments in Mail on iPad