My first post... I hope I am posting in the right forum.
I would like to know whether there is a clean way to customise the 404 Synology branded page embedded in the DSM nginx web server. I mean the error page generated by the DSM itself, not the Web Station one. For instance, the one which is displayed when you follow a File Station shared link which does not exist. After some research, I have found out that modifying the following file does the trick:
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However, I guess that this modification will be lost after every update. Besides, modifying this file enables the DSM system files have been modified unexpectedly alert in the Security Advisor so I would like to do this with some kind of workaround without disabling this check, if any.