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To maintain rapid application response time, QuickBase does not allow an import of more than 1000 records containing a user field. If you're unfamiliar with user fields, please review this help topic.
The 1000 record import limit only applies to records containing a user field.
If you have a file that exceeds this limit, consider breaking it up into chunks of data where each chunk contains less than 1000 records. Also, if your file is over 1000 records because some of the data you are importing is static, consider only importing your changed records instead of all archival data.