FTP "put" not copying file to remote host when ran from shell script but copies the file to remote host when ran manually

I suspect part of your issue is with the way you're constructed your heredoc. Try it like so:

$ ftp -n ${FTP_HOST} << STOP
user ${FTP_USERNAME} ${FTP_PASSWORD}

binary
lcd ${FTP_FROM_DIR}
cd ${FTP_TO_DIR}
put ${reportFileName}   
STOP

If you truly want those spaces/tabs in the command then you'll need to change to this form of the heredoc:

$ ftp -n ${FTP_HOST} <<-STOP
    user ${FTP_USERNAME} ${FTP_PASSWORD}

    binary
    lcd ${FTP_FROM_DIR}
    cd ${FTP_TO_DIR}
    put ${reportFileName}   
STOP

Whenever you have spaces/tabs within your heredoc you need to make use of the <<- for to tell the shell to strip the leading spaces/tabs out prior to running the commands that are contained within.

A sidebar on using echo

When you're parsing variables within scripts and you innocently use echo to print messages you're typically getting more than just the string you're interested in. echo will also include a trailing newline character. You can see it here in this example:

$ echo $(echo hi) | hexdump -C
00000000  68 69 0a                                          |hi.|
00000003

The 0a is the ASCII code for a newline. So you'll typically want to disable this behavior by using the -n switch to echo:

$ echo -n $(echo hi) | hexdump -C
00000000  68 69                                             |hi|
00000002

Or even better upgrade to using printf.

References

• How to use ftp in a shell script