Thanks @ncw. I did attempt that however it returns an error. See below.
rclone deletefile --dry-run --files-from filelist.txt dropbox:
2020/01/19 05:59:02 ERROR : Attempt 1/3 failed with 1 errors and: dropbox: is a directory or doesn't exist
2020/01/19 05:59:02 ERROR : Attempt 2/3 failed with 1 errors and: dropbox: is a directory or doesn't exist
2020/01/19 05:59:02 ERROR : Attempt 3/3 failed with 1 errors and: dropbox: is a directory or doesn't exist
2020/01/19 05:59:02 Failed to deletefile: dropbox: is a directory or doesn't exist