I tried everything and more but I am lost in what I’ve done 
I started to put 777 when this happened as I have 1 folder only for videos and even though I know I should not I just wanted to check if it would do the trick.
I was about to try @gazuzu’s solution but those permissions were already set.
I don’t know what to do anymore… I am way beyond the frustration point, I am at the “burn the synology” point