unable to set pdfinstance to null

[ishikachhabraa]

Basically i have different projects on one page and each has a corresponding download button, when i click on download pdf first time it renders correctly but when i click on some other project to download it , it renders the previous pdf first and doesn't download the corresponding pdf. So for this I wanted to clear the pdfinstance state. how should i do it?
const [pdfInstance, setPdfInstance] = usePDF({ document: <></> });