How to use ftp server to update firmware using OTA support

[kesha.modhia]

As I have login credential for the FTP server,
like FTP server :- 192.XXX.X.XX
PORT :- 21
User Name :- keshaXXXX
Password :- XXXXXXX

And I was able to establish the connection on the same and got the guide to use the FileZilla also like how to upload the binary on the server
issue :-

Don't know how to use that in the Esp32 application code.
I want to update the binary using the ftp server through FOTA but no idea how to integrate the credential in my base code.

Help and Guidance required.....!!!!