Adjust text when `multiple = false`

[euphbriggs]

First off, thank you for creating this package!

I'm considering using it on a project I'm working on, but I wanted to see if you would accept a pull request to adjust the text if the multiple prop is false? I was thinking of making the text reflect that it is only expecting a single file. Maybe something like this:

Thanks,
Ben

[euphbriggs]

Never mind, I just noticed that the paragraph was a default value in a slot. I can make it say whatever I want. :-)

Have a nice day.