Allow to select a custom directories for saving photos and videos

Suggestion: Allow to select a custom directories for saving photos and videos.

I've been using my Librem 5 as a daily driver for over a year. One of the most pressing issues nowadays is the continuous lack of space on the root partition. It would be a great improvement if I could save photos and videos in a custom directory on my largely unused micro SD card.

See also this discussion on the forums.

As a side note: Saving photos in the home directory of the user is also not what I expect, ~/Pictures or something like that seems more logical as a default to me.