Their use and format are described in the file_contexts and seapp_contexts sections. seapp_contexts file for /data/data and /data/user directories. It is such a powerful and reliable disk recovery software for you to recover files from partition or hard drive on your own. Data Recovery provides safe, fast and complete recovery. on /system/app at very early stage of boot proccess. Another idea is to bind mount some loop file or external SD card partition e.g. But never touch mmcblk0p1 or any other partition related to SoC or bootloaders. file:///data/my-sample-ota-builds-dir/ota-002.zip.
In this sample app url is expected to point to file system, e.g. SystemUpdaterSample app downloads OTA package from url. In most cases it should be located at /data/user/0//files/configs/. The directory can be found in logs or on the UI.