Our site is implemented using SXA. Currently,caching is set on CloudFair for our site. Due to this caching, any media file(eg: pdf, excel) we update in sitecore does not reflect on the site. I can download updated media item by appending some query string to the media url but not using the original URL.

Is there a way to fix this issue?

I can think of adding a query string params based on the media modified date? is this a right approach?

any advice and suggestions on this will be greatly appreciated.