Use of bought mockup to help preview a layout for sale + providing google fonts

Hi there,

this my first post as I am completely new to the market.

I would like to know whether it is possible to buy a mockup (e.g. brochure) and place a layout (for sale) on it to further describe the product. I would like to use produced images thereof (layout on mockup) just to promote the actual product I would like to sell (layout). Of course I would not sell the purchased mockup itself.

Would it be legal to do so by using a regular license or would I also have to produce the mockup myself - as the item (and not the mockup) might be sold multiple times.

In case the layout is also using google fonts is it legal to provide those or would the envato-customer have to load the font-files at the according google font page?

Thank you & kind regards