Importing dynamic fields is not supported

[fufenghua]

Describe the bug:

Steps to reproduce:
1.Exporting data from attu
2.Select Import data from file
3.Prompt column number mismatch
4.If you delete the $mate column, it will work fine.

**Attu version:2.4.0

[shanghaikid]

You don't have to use $meta. please check here to see the example data format.

[fufenghua]

You don't have to use $meta. please check here to see the example data format.

After downloading the sample data file, it still cannot be imported。

[shanghaikid]

yeah, looks like csv import is broken. please use json import now, I will fix it soon. thanks.