Hidden in plain sight
Objective
Find the file in your home directory that holds the flag, and read it.
The briefing
Two files were written into your home directory before you started.
Both have names that begin with a dot. A plain listing leaves those out, which is why a directory can look emptier than it is.
One of the two holds your flag. The other is noise.
Your home directory is /tmp/gen4.
Set it up
Run this in Termux. It teaches the concept above a second time, then writes the challenge files into your home directory.
ctf start 01 The tool tells you how many files it wrote, never their names.
Then find the flag and hand it in with ctf check 01 LEARMUX{...}.
Hints
Two of them, revealed one at a time. The tool works the same way and remembers how many you have seen, so nothing is spoiled by accident.