If you want to share the files you’ve added to your Sheets or Docs do the following:
Share all files uploaded.
Go to settings and select the type of access the users of the uploaded files will have.
Share files one by one
Click on the file name/link to open the preview page of the file.
Click on the title, this will open the file in a new tab.
In the preview panel you can share the file by clicking the 3 dots in the right corner. Click share to open the sharing screen.
When the share screen opens add the email of the user you want to share the file with.