Tails with YUMI syslinux.cfg not found

So a bit of a noob with this,

What i'm trying to do is install tails on a flash drive with a storage partition that can be used with windows. It's 32Gb so don't really want the extra space going to waste.

I've used YUMI (UEFI beta) to install tails on the first partition but when selecting it from grub i get the error /efi/boot/syslinux.cfg not found

Anyone experienced this before?