I would like to ask the user for a bunch of info (data) and then output chart for them at the end. Any way to do this, via an integration maybe?

I would like to allow people to do certain things only once or twice per 24 hours. What is the best/smartest way to implement some kind of counter that resets 24 hours after an action is completed?

I have a button that opens a Jpeg image but I would like it to download it to the users device instead. Is there any way to do this?
In html I would do something like this:
<a href="mysite.com/image.jpg" download>Download</a>