Not able to see collection

show collections not showing any collections

Which cluster and which DB?
Have you created the collection or checking for existing collections?
Can you paste command you used
show db

When you use the database, have you cased the database name correctly?

This works:

use 100YWeatherSmall

This doesn’t:

use 100yWeatherSmall

(I made exactly that mistake yesterday)

yes. i done the same mistake