Data missing after successful import

Try looking for a pattern with regards to what might have been missed. Lets say you have 4000 records create 10 batches of 400 each and try to upload it. Doing this way you may have a theory on what could be causing data importation to fail. Most likely it might either have to do:

  1. Data formatting issues
  2. Missing mandatory fields

Give the above approach a go we might have more information to debug the issue

Here are few links to posts on related topics that might help

  1. Import Log. Import Failed. Please correct the format of the file and import again
  2. Data Import Error - Please correct the format of the file and import again

You might also want to look and share import logs, that should also help determine the issue

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