If you experience any issues when uploading/downloading files with FileZilla, make sure you set the following recommended options in its configuration:
1. From Edit -> Settings -> Connection -> FTP -> tick Passive (recommended).
2. From Edit -> Settings -> Connection -> FTP -> tick Allow fall back to other transfer mode on failure.
3. From Edit -> Settings -> Connection -> FTP -> tick Send FTP keep-alive commands.
4. Restrict the number of simultaneous connections and transfers.
