You can send documents and images to JetSign from other apps, open files directly in JetSign from your device, or import them from Dropbox, Google Drive, or Microsoft OneDrive.
To add a document, select the + icon at the top of the page or the Add Documents button.
This video shows how to add / send files to JetSign for signing:
Our web version (https://jetsign.com/login) also lets you drag and drop files from the desktop.