You need permision to perform this action? Sharing hardisk via router

[Yurilady]

Hi i have a question about sharing file.
I use asus router rt-ac5300, and i plug hardisk on my router so all my laptop and devices can sahre file from it. It was fine to copy file into it and play video or data from it until yesterday, i got massage when copying file from my desktop to my hardisk router that said "you permision to perform this action". It was fine 2 days ago, and i didnt change any settung in both my desktop and my router. And this massage, only appear in my desktop. I can still copy file from my laptop to this hardisk router. Anyone have any idea what happen to my desktop? Or is it a virus or some kind? Thanks

 

[failboat]

No it's likely permissions. Each folder/file has a user and group.

https://www.techrepublic.com/article/how-to-manage-user-security-in-samba/