How to use OTG USB flash drive on phone

How to use OTG USB flash drive on smart phones. How to copy videos from Phones to OTG USB storage device, how to create a folder on OTG USB Flash drive on your smart phone, how to copy photos from you smart phone to OTG USB storage device. How to delete videos on your OTG USB pen drive,how to delete folder on your OTG USB pen drive,how to use OTG pen drive on smart phones,basic operations of copy and paste on OTG USB pen drive