there is this app that I found on fdroid that makes it pretty easy to log notes and photos on a daily calendar.
It certainly does not replace ANY of the other methods of documentation like videos and quality photos, and long detailed journal entries.
I just use it because it reminds me of the Snapchat Memories feature but FOSS.
It is a good starting spot, and makes it easy to document with photos.
It has been pretty good to me so far, I recommend that you give it a shot:
Can be found here: https://f-droid.org/packages/com.demizo.daily_you/
Github: https://github.com/Demizo/Daily_You
Looks like this
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