Apple devices by default have a pop-up blocker enabled for Safari. These files open in a pop-up window and will only do so if pop-ups are allowed in the device settings. Apple does not provide a "pop-up blocked" message when the feature is engaged and a pop-up is blocked.
You can access these files from Apple devices by altering the pop-up blocker setting of the device. To do this, follow the click-path below. After these settings have been adjusted, the files are accessible.