Remote folder mounts are only available to other applications which are using the
gvfs APIs for file operations, and which claim to support remote file operations when creating the file chooser dialog, to open files.
These folders aren't mounted in the typical sense of the word, as they are virtual file systems managed by gvfs. However, they can be accessed in applications which only support classic POSIX file operation calls, by looking under the
/run/user/$USERNAME/gvfs directory, where
$USERNAME is replaced with your username, to browse the mounts and files within, if you have the
gvfs-fuse package installed. You may need to unmount and re-mount the remote directory after installing, or possibly even log out and back in.