Using internal storage
Is there any way I can use my internal storage for video or photos please this is my reason for buy 256gb any help?
iPhone XS
Sure. However, that kind of storage is really only for device use. It's not something that can be used like a USB flash drive. It's possible to download a movie on iTunes to an iPhone, but if that's deleted on the computer the version on the iPhone can't be extracted as if it were a backup.
Anything in the camera roll can be offloaded to a computer though. Also documents can typically be emailed as attachments.