Problem on uploading a file using ftp (Filezilla) ---> wkhtmltopdf 43,5 MB

I got the problem that everytime I do an uploading of all _lib files the procedure stuked on trying to copy from local to server the (incredible crazy…big file) from the following directory…

Filezilla continue to try to copy it but everytime stopped and restart once again.

I did a workaround renaming the file wkhtmltopdf into . Once copied I rename it back to wkhtmltopdf.
I don’t know why but it works.

Are there someone who knows how to avoid this invented workaround ?