I once met a situation when I could not upload a large compressed css file to the remote server via any ftp softwares either FileZilla or Cyber Duck.
I could not figure out why even I’d tried to increase timeout setting, reduce the number of connection, etc. still it ends up the same.
Then I decided to transfer the file via SCP. But it was too slow as SCP always verifies its credentials at every connection established.
The other possible method is to use rsync upon this recommendation.
The syntax is simple:
rsync -avzh style.css email@example.com:/home/vkhost
/home/vkhost is the destination directory to have my
style.css file moved to. It was done in just a blink of an eye for the file over 175kb.