"Camera detected. A photo camera was detected."
This is the only message that pops up temporarily on the desktop for the camera when plugged into a USB port and turned on in download mode.
It is a Canon PowerShot SD1000. Other than flash or not, macro or normal, auto or not, I have not had to change anything on it. The only "mode" switch I know of is the slide switch to switch between still photos, movies or download.
Just to reiterate a final time, the camera has always been seen as a storage device on every OS including Debian 9 Stretch. The program I use is Shotwell and it has always downloaded all images or videos with ease. Further, the camera as storage device has always been accessible in any file manager at any time, only requiring mounting to see contents. I do not know how to explain it further.