permissions - Nautilus cannot write into 1st directory of a NFS share

I have a synology NAS.
On the client I create the directory :

mkdir /media/feydreva/download
chown -R feydreva /media/feydreva
chmod 777 /media/feydreva/download

I can mount my NFS without any issue :

sudo mount -t nfs 10.2.1.3:/volume1/download /media/feydreva/download

I can create file and directories into it

mkdir /media/feydreva/download/AAA 
touch /media/feydreva/download/aaaa.test

But, when I use ubuntu explorer (nautilus), annd I go to that directory, I cannot create new folder. I cannot save file into it.
I can go into the AAA directory, and here I can create folder and save file.

Interresting thing is that with Libreoffice, I can create a directory and save a file into /media/feydreva/download/ ,only nautilus cannot.

id : uid=1026(feydreva) gid=1000(feydreva) groupes=1000(feydreva),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),118(lpadmin),128(sambashare)

 getfacl : suppression du premier « / » des noms de chemins absolus
# file: media/feydreva/download
# owner: feydreva
# group: feydreva
user::rwx
group::r-x

other::r-x

so today (02022018) :
I tried changing the uid of "feydreva" my PC, to match the one of "feydreva" on the NAS. So i changee the uid to 1026.
I did a
sudo chown -R feydreva:feydreva /media/feydreva/download
I still have the same exact issue: cannot write on /media/feydreva/download, but can in /media/feydreva/download/AAAA using nautilus, works fine in console/bsh or libreoffice..

Any idea or suggestions ?