I'm looking for a cover with microsd slot but I haven't found nothing. So I want to know if there are problem to make a thing like this or nobody hasn't thinked about it. I think that make it is possible because there are some OTG that read microsd(I have it) but with it I can't charge the phone and I'm afraid of break it when it is in my pants. I've thinked to make a cover with microsd slot and external battery(like the image below), it is possible?