These are the formats required for the BulkOps app for Jira (Pro)
The file format acceptable for uploads must either be a CSV or xlsx file
All files upload must be encoded in UTF-8 character encoding, any other encoding won’t be accepted by the app
Each feature of the BulkOps app for Jira (Pro) requires either a 2-column or 3-column CSV file. Ensure that you go through the documentation to see which one applies to the feature that you want to use.
The delimiter of a file has to be any one of the 5 types of delimiter that is permittable by the app. See https://en.wikipedia.org/wiki/Delimiter to understand more on what it is.