Kibana 7.0.1 won't lad index pattern

Thank you for getting back to me.
Yes, that's what I did. The index was there after I load the data. But the index pattern is not created right after this.
If I navigated to Discover page, this is what I see:


Basically, it looks like the index pattern was not being created successfully.
It just keeps asking me to create an index pattern.

This post had described the same thing.