How to install FTP server in TERMUX Step by Step Guide 
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Telegram post: https://t.me/efxtv/3252
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STEP 1 - Allow storage permission 
$ termux-setup-storage

STEP 2 - Update Upgrade Termux
$ pkg update && pkg upgrade -y

STEP 3 - Install Python
$ pkg install python

STEP 4 - Install Python-PIP
$ pkg install python-pip

STEP 5 - Install FTPDLIB 
$ python -m pip install pyftpdlib

STEP 6 - Start FTP Server in termux 
$ python -m pyftpdlib

STEP 7 - Create alias to Start PyFTPdlib
$ echo "alias pyftp='python -m pyftpdlib 2>/dev/null &'" >>~/.profile
$ source ~/.profile

STEP 8 - Start pyftp
$ pyftp

STEP 9 - Stop pyftp
Ctrl + c

NOTE: Use CX File Explorer (https://play.google.com/store/apps/details?id=com.cxinventor.file.explorer)  to access FTP on android

FTP CONNECT 👇👇
- Open CX File Explorer 
- New Location 
- Remote 
- FTP
- Enter Host IP 0.0.0.0
- Port as 2121
- Check mark Anonymous 
- Click ok

Must read the related post How to set up SMB in Linux (https://t.me/efxtv/2718)