We have several different storefronts on our Magento account.
We are planning on creating a blog page for each website, but are unsure of how to go about doing this with Mageplaza. It is also not clear on how we can upload a blog content piece to a specific blog without it going to all the different storefronts.
Any advice or suggestions would be greatly appreciated.
Although it say that there is multistore support, it doesn't look like it's fully supported. Looks like you'll have to hire developer/agency to add missing features for you. Maybe Mageplaza also have something about it, you should reach to their support first.