I use orgzly [1] and configure it to "sync" to Syncthing's local folder [2] (which Syncthing then syncs). This requires write access to Syncthing's data directory though, so I'm not sure it works on stock Android.
[2] e.g. configure a "directory repository" with content://com.android.externalstorage.documents/tree/<device id>%3AAndroid%2Fdata%2Fcom.nutomic.syncthingandroid%2Ffiles%2FSync%2Forg
I'm running a stock Pixel 2 and I've been using syncthing to sync pictures and videos to my desktop automatically, but didn't know about Orgzly. I just hooked up Orgzly and syncthing and it worked without any issues. Thanks for commenting about orgzly!
I open drafts in Gmail with no recipient and keep notes there. Super convenient since I usually have it open anyway on the desktop, it works great on mobile too, and gmail search makes it easy to find stuff.
I've been doing the same for about 15 years, except I actually send the emails to myself and have a special tag for them. Unfortunately, Gmail search has failed to find things for me in recent years that I know are there and know are tagged with a particular key phrase, usually for things that are from the 2009-2013 time period. I've lost faith that they are actually keeping everything, or perhaps that they are keeping everything but their search algorithm may sometimes return "no results" in order to be fast instead of actually falling back to some kind of deep search.
The one downside to this is that if you accidentally delete a draft (with a mistaken mouse click on the trash icon), it is impossible to ever recover the draft.
