If you use Apple mobile devices:
If you use Android mobile devices:
When you are on your Windows computer:
When you are on a Mac computer (macOS), we suggest you sign the PDF document with the Preview app that comes with the system.
Alternatively, when you have received a PDF file that already has the interactive signature field ready and requires your Adobe Digital ID to sign, such as this:
You can click this quick video quick tutorial for how to use your Digital ID to sign.