All ASUS routers that have USB file sharing use Samba v1, and only Samba v1. And that’s not the only NAS devices that are still sold with Samba v1 only.
On a current default Windows installation, you can’t connect to Samba v1 at all, you have to manually activate it first.
Also true with linux. The difference is I have to check one box in Windows. In linux I had to edit what are essentially the registry keys for 2 different programs (packages), then add a manual argument in fstab for mounting it. Oh and there was no encompassing tutorial for that task that was easily googlable, me figuring that out was the result of combining like 3 different random bits I got off of forums after almost 8 solid hours of exhaustively searching the subject.
With windows ‘enable samba v1 share’ pulls up result one how to do it, you open one program, check one box, and you’re done.