I found that in default Camera App, if you want to save all the photos you take in SD Card, you have to select twice:
- Select rear camera view and go to settings and select SD Card.
- Select front camera view and modify the storage folder too.
As I realiced, if you only select SD card with, for example, rear camera view activated, then the FP will save your front camera photos or videos in a different folder (actually in the phone memory, not in the SD Card). This is pretty weird, I know, but maybe this is related to your problem. Hope it will help you 