I had test case contains around 50 test steps. I don't prefer to upload the test steps one by one for 50 steps. So it is possible to Upload all the 50 steps at single shot from Excel to JIRA.
Yes, you can do it via CSV option - https://confluence.atlassian.com/adminjiraserver071/importing-data-from-csv-802592885.html
In general, you can definitely use the CSV option that Mirek mentioned. This is great for uploading or updating a lot of issues all at once.
That said, it also depends on what you're using for Test Management. Are you using an add-on to provide you with additional functionality? If yes, I would refer to that add-ons documentation to see if you can upload test steps to a test case in bulk.
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