Hi,
Would it be possible to know how you confirmed your orders ?
HikaSerial is not compatible with the confirmation of the order in the HikaShop order listing (because the email is processed before the real modification of the order status, so the serial is not existing when the email is created because the order is not really confirmed, yet).
HikaSerial is compatible with confirmation thanks to payment plugin or when editing an order directly in the backend.
That could explain some of your issues.
But once the order confirmed, when you use the "email" button in the HikaShop backend (when editing an order) you should see the content of the serial and you should receive the "attach serial" image too.
If in that last screen you can see the serial but the image is not attached, I will need details about the mail system your using with Joomla.
I know that some mail plugin in Joomla does not support the inline attachment ; so we have a special option in the "attach serial" plugin (available thanks the Joomla plugin manager) to use an alternate mode for mail attachments.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.