Probably looking in the wrong spot!
You should still be able to log in from Windows to Android_xxxx/share/sdcard as I do to place files into the /download directory and also to /data to copy
Kodi files for backups.
Under Android 7 the internal and attached USB drives come up under Android_xxxx/share/media_rw/sdxx
A physical SD Card, however, is found under a separate folder; Android_xxx/share/media_rw/mmcblk1p1 (or whatever your card shows). This SD Card name has not changed since the original Android 5.1 firmware (/media_rw folder name is new with Android 7).
[Firmware 2.0.3 Android 7, Windows 10]