Re:File upload (permission denied)
Hi,
Yes, click the permissions icon next to each file gallery. If you add one permission to the file gallery is kind of disables any other file gallery permissions any user has. So you will have to assign those permissions for each group you have onto that gallery.
So for example
if you add admin group allowing batch upload. It will turn off all other permissions any user will have to download any files. You would need to also add registered (Whatever group you have) users to download and view the gallery.
Hope that explains it a little better. 
Damian
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