If iTunes did not open automatically, click its icon in the Dock (macOS) or in the All Apps area of the Start menu (Windows).

Click the app in the right panel you want to share with. For example, if you’re sharing an Excel file, click the Excel icon. Click Add File in the right panel to open your computer’s file browser. Browse to the file you want to share to the iPhone. Select the file and click Open to add it to the list of files for that app.

Click the app in the right panel that contains the file you want to share. Select the file. Click Save to in the right panel to open your computer’s file browser. Click the folder on your computer where you want to save the file. Click Select Folder. The file is now accessible on your computer.

Under “Who Can Access,” select Only people you invite to share with certain people. If you want anyone who has the link to be able to view the file, select Anyone with the link instead. Under “Permission,” choose whether people with access to the file Can make changes or can View only. Tap the back button to return to the “Add People” screen.