Influxdb cloud 2.0 data retention time reference

Dear all,

I’m using InnluxDB Cloud 2.0 for my experiments and learning tasks.
I upload data, I can see them in Chronograph, I can get them back in my queries…however after an hour (approximately) data disappear from the bucket, although the data retention for the free tier is 30 days.

The timestamp of the data series though refers to a period in 2018, is that the reason that the data go off? or I miss something bigger than that?

Thank you and forgive me about the newbie question

Actually, it is like that. The data retention is referenced to the timestamp and not the upload time. Thanks to my colleague Lushan for the heads up.