QNAP shared folder permission denied

Hi have been successfully running Synthing on my QNAP for a number of years, but recently I had issue where the drives all got full and backups stopped, I reclaimed alot of disk space back by archiving off the data. Then I noticed I could not launch Syncthing, web page just gave generic message not available. I tried starting and stopping the ST app but no joy so then I deleted the app and installed it again. Upon starting everything is back to first time setup. Now issue is I try to add the folder I wish to sync my clients with but not able to as its says permissions denied. I am logged into QNAP as admin, but I cant work out how to see what account the syncting app is using.

Any advice.

ps aux|grep syncthing

Is it wanted the .stignore path begins with lstat/... when other errors show path start with stat/...?