I have my phone set up son that all pictures and videos are on the external sd card, however when I look in storage, it's showing 3.4gb of pictures/videos on the device. When I navigate to device storage there's a folder called DCIM which includes a few folders, however they're all empty. Despite this when I long press on the folder DCIM I can see there's 3.4gb of data in there. Can I free up this by deleting the folder, or will this impact on something else?