I have a tablet running marshmallow 6.0.1 and I just lost the ability to write to my external SD card. I have redone the access permissions but no luck. I'm able to transfer files off the card to my device, but I can't move anything to it. It was working just recently. I am hoping someone knows the work around to getting permission to work again without having to do a factory reset. I'm not using a rooted device either. Im not sure how it stopped either. Anything will help. Thanks everyone.