Install OC 10.0.7, create a share with “Upload only” mode and share the link.
If the activity app is enabled you’ll likely get a digest by email regarding any file changes in the system, including the ones uploaded in the share folder. So while it’s not an email specific to the share, it should still contain the information you need. The email is sent not immediately but later on, I believe it depends on the cron.php run frequency.
I don’t know. The ownCloud project itself doesn’t officially provide apps for NAS.
The apps are likely created by third parties so you might need to ask there.