How can i use JIRA API to add an attachment to an issue with C#.NET?
Did you try reading JIRA REST API documentation? There is a REST call (PUT) named "/rest/api/2/application-properties/{id}" which you can use for your purpose.
Did you try reading JIRA REST API documentation? There is a REST call (POST) named "/rest/api/2/issue/{issueIdOrKey}/attachments" which you can use for your purpose.
JIRA Command Line Interface action addAttachment
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