Why cant i fully edit an file via FTP?

[lovebug]

I see this

and a 250KB text file with a load of website addresses

maybe the file is hitting the file size limitations ? see the link below

Why are my files deleted after uploading them

Sometimes, when you upload a file, the upload is completed but the file is deleted immediately afterwards. This is usually caused by one of the following issues: The file is not in a htdocs folder All websites files must be uploaded to either the main htdocs folder, or to the domain specific htdocs folder (like example.com/htdocs). You cannot upload files to other directories on your account. If you try to create or upload files anywhere else, they will be deleted automatically. The file type…