I need to migrate and merge the contents of 2 old iPhones (lets call them i1 and i2) to a new iPhone (i_new).
iPhones have built-in migration functionality, but AFAIK it doesn't allow to move stuff from multiple iPhones onto a single device.
So, I am planning to migrate the contents of one older iPhone i1 to i_new with that tool and then move the stuff from the other one (i2) to i_new manually. Specifically: Notes, photos & videos, safari tabs.
I can access the photos on i2 from a computer (within DCIM folder) using a USB cable.
My question is: If I move the contents of i2's DCIM to a PC, what would be the best way to add these photos to the i_new such that i_new would be able to accept them in its Photos App and properly sort them by the date taken within its "camera roll"?
Can I copy them from PC to i_new's DCIM, or is iPhone's storage read-only when connected via USB as a "flash drive"?
Also, are all photos and videos from the Photos App located within DCIM, or are there any photos/vids hidden elsewhere?