My Fairphone 2, OS 19.05.3
I had to reformat the SD card (thread SD card loses write permission suddenly) and it is now implemented as “mobile storage” and all backuped pictures are restored on the card.
In the default camera app on Fairphone I don’t find any option to store the pictures to the SD card. Where is it hidden? I tried with an other camera app - there I found such an option.