about termux, might check out my wiki
https://forum.rclone.org/t/rclone-on-termux-turn-your-android-phone-into-a-media-server/16064
tho termux is command line, it can create icon/shortcuts on the home screen and run scripts at boot.
click the icon and it runs the script.
i use termux to sync keepass from desktop to phone and to backup andotp.