In Linux, we use a Linux OS feature known as inotify.
The kernel (OS core) offers a service to applications. That service sends notifications when there are changes in any of the directories it’s been given to monitor.
On Synology, or any smaller NAS, the table (in memory) which keeps track of which folders to monitor can fill quickly.
We can address this by making it bigger (customize) to suit our needs.
Here is the Synology FAQ which tells you how to address the problem.
Please give it a read and let us know if it addresses your second issue.
