virtual folders do not have permission to perform uploads, only real folders mounted in the VFS have this possibility
if the subfolder is a physical child on the hard disk of the uploaded folder, it will have the same rights as its parent, on the other hand if the two directories are neither parent of one nor parent of the other, it is possible to mount the 2nd as a child of the first in the VFS as actual directories (red folder icons) and individually assign the necessary permissions but it does seem like the inheritance persists, a solution to invalidate it is to put a filter mask for the upload of the sub-directory in the files mask tab, put \*.* in the upload field ( which means none matching the mask *.*)
this will not prevent the user from being able to send a file, but hfs will refuse to save it
the solution that can be adopted is to create an account named for example "noupload" protected by a password not found with special characters
we configure the parent to authorize the upload to any authorized person, then for the subfolder we only authorize the upload for the "noupload" account, this deactivates parental inheritance and the upload button will not appear, for remote maintenance needs, we can also authorize the upload for the account that manages the server in addition to the right to delete the subfolder
I remind you that the child must not be a direct subdirectory of the parent on the disk, although theoretically it could work indirectly
I see that it is the exact suggestion from rejetto above
