By default, you need to manually tell the program to re-scan your folders every time you add something, which is annoying if you add new media regularly.
Here they are, listed in terms of how easy they are to set up: Tell Kodi to update the library every time it starts up. Use Library Auto-Update, a lightweight add-on that re-scans folders on a timer you set.
Use Watchdog, a slightly heavier add-on that monitors folders and adds new files in real time. This is ideal if you are constantly adding new media, but takes up a lot of system resources and might prove unstable.
None of these methods are particularly complicated, but the two add-ons are going to require a bit more effort, with Watchdog being the most work. To get started, click the Settings gear from the home screen. Next, head to Media Settings. Note that there is a different option for Videos and Music.
Toggle those two options and your done: Kodi will now update the library every time you start it up. How to Install and Configure Add-Ons in Kodi Some people rarely, if ever, restart Kodi, putting the computer to sleep instead of shutting it down. Library Auto-Update is a Kodi add-on that lets you set a schedule for re-scanning your library. The add-on is lightweight, too—all it does is trigger the built-in library scan on a regular basis. Scroll down until you find the add-on, then install it.
Access the settings and you can configure whether or not each update has notifications. There will be many updates, so consider toggling this. Under the Video and Music sections you can set how frequently updates occur. By default all of your video sources will be scanned, but you can instead set specific folders to be scanned here.
Do that and only the specified folders will be updated regularly. If you delete videos frequently, you might be annoyed to see them still referenced in your Library. The Cleaning section of the settings lets you take care of that. This will take a bit of time, so only enable this if you really do delete media files with some frequency. Monitor Your Folders in Real Time with Watchdog Scheduled updates are nice, but if you add media files constantly, they not enough.
Kodi will start adding new files to the library basically as soon as you put them in a source folder. From the main settings, you can tell the add-on to remove deleted files from the library, or even to scan when you start up Kodi. By default, the add-on will scan your complete library, with all sources, but you can set it to watch specific folders instead.
From here you can set the polling interval in seconds; that is, you can set how often Kodi will check folders for new files. You can also set a delay between finding a new file and adding it to the library.
You can even set Kodi to automatically scan the entire library when new files are added. Overall, Watchdog is the most complete tool for automatically keeping your library up-to-date, and is a must for automation freaks.