Emailer Not Sending Full Zip File

I have a process which creates 4 asc files, and then sends them to a zipped file. 

At the end of this process, this file is to be emailed. I have an attribute creator which creates the file name as ‘attachment’, as it does contain dynamic elements, before using that attribute as the attachment field in the emailer. 

When i run it on my local computer, it works perfectly fine, and I get an email with all four files zipped. However, when i run it on FME server, the zip file only contains 1 of the four. Regardless if the files have content or not, they should all write to the folder, and then do, i can see in the fmeserver directory, that all 4 files have been zipped up, but when it is emailed, it just seems to delete three of them. The sampler is there so it only sends one email, but the attribute creator refers to the zipped file, which is created in the system caller, so all four should be sent.