Continuing FTP upload after lost service

[G.I.O.]

I hope someone can help with this one.

I need to be able to send large files to my clients. I'm in the process
of testing out how well this will work and I have already reached a snag
in the upload process.

I'm using a program called FTP Commander Pro (latest version). It claims
it can continue an upload after a signal or connection loss... but I
cannot make that work. The reason, as best as I can determine, is that
the server I'm uploading to (a commercial host I use for my web sites)
does not create the
file (or at least the file name) until the upload is complete or I press
the cancel button.

Is this common among servers not to create the file name immediately so,
should there be a connection loss, one can pick up from that point? Who
creates the name... the server or the FTP program?

Thanks!

 

[G.I.O.]

....I need to add...

After some time, maybe 10 minutes or so, it seems the temp file that was
created after the signal disconnect (its called "pureftp-upload........." )
changes it's name to the actual file name. At that point I can continue the
upload. You do not see this temp file unless you reboot the FTP client and
find the folder you were uploading to. You must then keep going back to it
(reboot client) and after some time it will be the actual file name.

I find I cannot change this temp file name manually. I get an error. I must
either wait for it to change on it's own or restart the upload from scratch.

Any thoughts? Is this common to other servers out there?