This might likely be a permission issue. Maybe you can check some files in your folder for permission using the terminal.
Simply navigate into your target folder and type
Then take a look at the left column:
d tells you if it is a directory. Then you have 3 chunks consisting of 3 letters each. The first chunk is for the
user, the second for
group and the rest for
r = read,
w = write,
x = execute.
rwx-xr-x would mean that
user has all rights,
group can only read and execute (not write), and other can only execute.
To be on the save side, you could set everything in this folder to
rwxrwxrwx by typing
chmod ugo+rwx * -R into the terminal. u for user, g for group, and o for other. And via the
+ you'll give all three of them all permissions. The asterisk is the wild card that stands for everything that is in this folder, and the
-R (recursive) makes sure, that you also cover the subfolders.