Android TV (10) grant permission and write on external storage (USB)

I've tried different file managers on this Android TV 10, but none of them is able to write on the external memory. In the past and other Android TVs, I have written on external storage without this hassle. On Settings, I've granted "Storage" permissions to all the file managers. For example, CX Explorer showed an overlay window with information about the process to grant access to SD in a supposed next window, but no window was open to do these actions. Has Google imposed restrictions on writing on Android TV 10? What can I do?