Earlier quoted context omitted.
Do you know if you can add hiking trails using StreetComplete? I noticed some trails are missing in my area and I would like to contribute
Last I checked, not with StreetComplete. But the OSM wiki has a table of Android apps https://wiki.openstreetmap.org/wiki/Android which column "Record tracks" can be sorted by, to see which apps have that feature. How I've done similar before is to record a GPS trace with an OsmAnd plugin, upload it to OSM servers, import it as an overlay in the web-based editor on desktop, and used that and satellite imagery as refe…
If you added a gopro and SLAM to the GPS trace and imported USGS topographical data I wonder if you couldn't fully automate the process.