If you're unable to import your synonyms with the CSV file please make sure the file contains one set of comma-separated synonyms per line.
Here are some of the things to check before formatting the CSV file:
- Make sure to remove any empty rows,
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If you're getting the "Failed to upload array must contain at least two elements (in [0])" message, make sure you're not wrapping each line of synonyms in quotes or you're not including a single word on one line,
- A single group of regular synonyms can contains up to 20 words maximum 100 for oneWaySynonym (as documented here), otherwise you will receive the following error "Failed to upload too many synonyms in n-way synonym".