The documentation for importing CSV files gives an example for adding worklog entries:
Summary,Worklog Only time spent (one hour),3600 With a date and an author,2012-02-10 12:30:10;wseliga;120 With an additional comment,Testing took me 3 days;2012-02-10 12:30:10;wseliga;259200
When importing this file to a project with existing issues a new worklog entry is created for each issue. But the total logged time of each issue is set to the value from the import file. I would expect that the time in the CSV file is added to the "time spent" of the issue.
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