On iPhone 5, Nexus Android tablet and Samsung S5 after clicking 'add media' then selecting an existing album, clicking the 'Add Media' button returns an error: I'm running PHP 5.5 on a Windows server and the I believe the max query length is a security thing. I don't know the value it is set to. But can't imagine a lot of information needs to be transferred when clicking to go to a page to upload photos. Is there more in there than needs to be? Firefox on windows 7 doesn't cause any problem - it's only phones and tablets.