The very same Excel file I have been uploading for years is now suddenly Too Large -- I had to call tech support, save to new CSV and go through multiple steps. I don't see this as an improvement at all.
Also, the help hints when the file was rejected -- to delete empty columns -- makes no sense in an Excel file using only one column listing emails. No way to remove extra fields. Uploading a column of 10,000ish addresses should be an accepted file size.
Tech said this is "improvement" is to facilitate customers who need to find non-exact matches and pull up similar emails -- if we don't need this service we should be able to opt out.
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