I would suggest creating a folder on your Windows 10 machine to record to. Then setup a script that is run every 5, 10, 15, 30 or however often you want that moves the files from your computer to the ReadyNAS. You will have far fewer issues with recordings. I do a similar process to move recordings from my SSD I use for recordings to a HDD. Just include both the local folder recording to and the ReadyNAS storage location in your library setup so Plex can see both locations. You then pick the local folder to record to instead of the NAS folder.
My Library Folder Config:
Recording Settings:
One line in my script to move recordings. Script runs every 5 minutes on my system:
robocopy /MOVE /S “G:\TV_DVR” “F:\Recorded TV” /XD “G:\TV_DVR.grab”
/MOVE - moves file instead of copy
/S - copies subdirectories excluding empty subdirectories
“G:\TV_DVR” - where to move from
“F:\Recorded TV” - where to move to
/XD “G:\TV_DVR.grab” - exclude the grab folder from any moves
