@joseph_1979 The problem is that my Reolink cameras can't connect to the Synology NAS at all. When i enter all ftp credentials and try the test button, Error 454 occurs: "Connection failed. Please check your network connection". They are at the same network using the same subnet. I just used Filezilla as a client to test the Synology FTP server, which works fine then. I don't use Filezilla as a server.

There has been some progress though. Although my RLC-820A stated there were no new updates, i found an update on the Reolink website. I updated it to v3.1.0.764_21121717 and now ftp does work with exactly the same settings as before.
Now i have to figure out how to get the RLC-842A and RLC-520 working. They do not have new firmware updates.


Edit,
Support replied quickly and sent me a new firmware for the RLC-842A, this fixed the issue. Next is the RLC-520.

Did you get this to work? What was the solution?
I have an RLC-820A, RLC-520 and an RLC-842A and neither can connect to my Synology FTP. Error 454. When i use Filezilla to connect to the Synology FTP with the same credentials i can connect to it easily. All Synology user permissions are correct, otherwise Filezilla wouldn't work, right?