USB Mass Storage, PTP, MTP
PTP = Picture Transfer Protocol
MTP = Media Transfer Protocol
With
USB mass storage, a device presents its data to the computer as a
file system.
MTP operations are limited to enumerating files, transfering entire files and deleting a file.
Although the P in PTP refers to pictures, the protocol can also transfer other formats found on a phone.
[MTP and PTP] are some of those I wonder why they even have to exist. Why can’t cameras and phones just make it possible to mount their filesystem and access their files so we can work e.g. with the photos with take? It’s just flash memory with usually a FAT filesystem which any system can read, after all.