hope you've solved your problem. If not, find customer service in the website: https://www.allpcb.com/
You can find online consultation here: chat with us(blue button) on bottom right corner of the homepage.n
if you want do Panelized PCB's, you need to send your gerber file to ALLPCB.
their email address is email@example.com.
thier customer service is nice, they will tell you how to solve your problem.