Consistently getting "corrupted on transfer: sizes differ" syncing to an SMB share

sure.

yes, to mount the samba share locally using native windows os.
no, as i do not use local remote. i copy direct, like so
rclone copy c:\folder \\server\share

https://forum.rclone.org/t/rclone-copy-fails-to-wsl2-dos-copy-works/38351