Easy way to save to pdf instead of preview?

Right now when `:MarkdownPreview`, it opens up a webpage in localhost, and removes it when I switch buffers in Vim. What I would really like is to have several different .md files open in my browser at the same time. Could there be some support such that we can do

`:MarkdownSave filename.pdf` or bind the .md file to some name `filename.pdf` (maybe the file we are editing is filename.md) so that when we do `:w`, it is saved immediately?

For example,
we're editing file `eg.txt`
We do `MarkdownSave` and it saves and opens up a pdf file saved on your working directory.
we make changes and we get the updated file immediately?