I can't share any file/photo/document etc

Hi, i have an EX4100, everythng works flawlessly except for sharing files by link, the NAS is behind a firewall i have configured, but even if i connect it directly to modem, without any firewall, everytime says the same error, maybe someone could help me (sorry if something is bad writted, english its not my native language)

thanks in advance

Where do you get this message? What file manager are you using to generate the link?

I just tested using the cloud access and it worked without any problem. Can you detail the steps you’re taking? Did you try to share a different type of file, like a picture? What browser are you using? Disable any ad-blocker you have and test it again