You might receive a comment that the data is linked, not imported as the other thread so the incorrect determination of data types doesn't apply IMHO.
When linking to a sheet that has columns with entries greater than 255 characters, the column is mapped as a memo field type and the character cut off point for displaying in Access is 255 although the underlying data is not affected. The work around is to import into a table where these fields are of the memo (now long text?) data type.
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.