cgsecurity.org

I'm trying to use PhotoRec to recover some photos but am unable to see the phone as a selectable storage device.

I'm using: an Android (OnePlus 5T) running Lineage OS with root privileges; photos would be stored on internal storage as opposed to SD card.
Developer/debugging mode turned on
Activated as USB storage device

Windows treats the phone like a USB drive, but I can't see it at all using the application. I feel like I've read the instructions correctly but it doesn't seem to be able to see the phone no matter what I do.

As yor phone is rooted, you should be able to export a copy of the internal memory, see
https://dfir.science/2017/04/Imaging-An ... nd-dd.html
or try something like Once it's done, use photorec on the img file (Select the file, Open with, and choose photorec)