Where can i delete the files to reduce the average file storage?

Hi,

Is there any way to delete the old files? If yes please help to guide where can it be done.
Dashboard | Sendbird))

Please help to clarify:
Can it be set up notification before reaching the limit?
Does it get automatically reset to 0 every month? or Any best practice?

Thanks
Zac

+1 on how to delete old files.
My application have 500GB+ file usage. And we want to clear old historical file so we don’t get charge every month for the over usage.

What is the best way to do that?