Why my local pc to seedbox speed os not crossing 5MBps ,failing at hgh speed FTP

Why my local pc to seedbox speed os not crossing 5MBps with SFTP using any major ftp clients.

whn i use FTP its giving me 300mbps as i have1 gbps fiber connection. but the catch is that it's failing large file upload at 80% and giving error as connection aborted.

e.g. for 15GB file upload from local pc to seedbox it's failing at 10GB as connection drops.

Kindly help me , if i have to do any setting change with filezilla or my firewall , i am new to file upload to seed box.

Use WinSCP, configure it to save the config to an ini file and change the background transfer count to like 20-30. It won't speed up single file transfer, but will speed up multi file transfers. And you can always put any content uploadable to a seedbox to a 7z archive split every 500MB and then extract it on the seedbox that way getting access to the multi file upload speed even if you only want to upload a single file. To speed up the archivation process you can set the compression level to 0 - Store so it would just split the file instead of compressing it, which is significantly faster than the default compression level.