[scorpioxy]

For the unresolved photos issue; I am not an iOS user so not sure if there's any application to help you easily achieve that goal on that platform. But in general, you can encrypt the sensitive files themselves(either files or directory).

You'll lose the ability to easily and quickly look at the photos, as in a single click and you're in, but the process would achieve what you want. To view the photos, you can mount a decrypted version whenever you actually want to look at them and can automate some of this process if it is time consuming or you do it frequently. This is all much easier to do on a computer rather than a mobile a device.

On Linux, there's ecryptfs. There were a few other similar tools in various states of maturity and maintenance when I checked. Perhaps look into something similar for your platform.