You can share your PDFs with other people or apps.
- Tap on the "Edit" button at the bottom
- Select the documents you want to share
- Tap the action button next to the "Done" button in the tool bar
- Tap on Share
- Select an the app extension from the share sheet, or select the "Open In" extension to see a list of apps that can open the PDF. Some extension have options. For example: the note to add the PDF to in Apple's Notes app
- Tap "Save" or "Done" to complete the action