Work through the checks
1
Check the column mapping
Open Import from file again with the same file and look at the mapping. A column left unticked, or given the wrong name or type, explains most wrong tables.
2
Check the row count
A file with more rows than your plan holds imports up to the limit. The import dialog says so before Create table is pressed.
3
Check the file itself
Open the file in a spreadsheet. A missing header row or values shifted by a column reads as garbage on any importer.
Good to know
Can I just import again?
Can I just import again?
Yes. Fix the file or the mapping and import a fresh table, then delete the wrong one.
Why is Create table greyed out?
Why is Create table greyed out?
The import needs a table name and at least one ticked column. Every ticked column needs a name, and no two can share one. Fix what the dialog names and the button comes alive.
Next steps
Import a file
The full import reference, mapping included.
Rows and cells
Fix a table in place: rename, retype, delete.