I can delete files from the Samba server on Windows, but not from Android.

[TheOldPresbyope]

Note the information displayed just below the SMB File Sharing On/Off switch in moOde's System Config screen

Server Message Block (SMB) allows files to be shared over a network with Windows, Mac and Linux clients.
Shares: NAS, NVMe, SDCard, Playlists and USB shares are automatically created.
Access: Specify "anonymous" access or userid = guest and no password when mounting shares.

Regards,
Kent