For example, such UGREEN Nas has a mobile or desktop application that serves for remote access via a generated token. Although I did not understand how it is with granting access to a friend, and the fact that I have access to the interface through this token does not mean that I have remote access to the installed applications. I don't know how it works, I just noticed that new systems like UGREEN or FNOS go this way. It's probably a better way than Tailscale, which I would have to manually set for each friend or family. In addition, I noticed that these systems have Internet applications such as a gallery, a movie application and a file manager in the user interface, so through this mobile application and token you have access to everything directly from one interface and you do not have to open 10 applications separately.