[NorwegianDude]

What do you mean you miss it? What is stopping you from doing exactly that now? Plug it in, drag down the drop-down and make you phone identify as storage. Then you can copy video off it while moving music onto it, if that is what you want.

[numpad0]

That uses rather unstable protocol called MTP that is rather slow and unstable. Pre-iPhone devices often supported USB Mass Storage. Protocol difference.

[Arrowmaster]

Yes but they needed to unmount the storage media from the phones OS to be able to present it to the computers OS as a USB Storage device. That works great when the storage is only used for media files and those functions are disabled when you plug the device into a computer.

People often lament about the early days of smart phones where you could put in a microSD card to expand storage and even move apps to it. But nobody remembers the details of how janky it really was. AOSP and Googles own Nexus phones never supported apps on microSD, it was added by other manufacturers and was not perfect, often apps crashed when running from microSD or ran slowly.

I'm not defending MTP either, it's a mess too and hasn't gotten any real multiplatform improvements since back when it was first being used for MP3 players.

[causality0]

No, you can't. Try it. It will only let you read or write from one location at a time. If you're copying files out of one folder you can't even find out what files are in a different folder until you're done.