# of contacts uploaded at once? 500 & 250 would not load & finally 125 worked. Only 4 columns excel
Contact files with more than 40,000 contacts can cause import errors. But it does not sound like this rule applies in your case. Are you receiving error messages? Was your file downloaded from an outside source? We have seen cases where files downloaded from an outside source can carry over problematic formatting. In these cases we suggest saving your excel as a different file type. Are you able to upload your full list when it is saved as a CSV file instead?