Difficulty uploading and using an Openstax test bank

[AngelaThurman]

I am having difficulty uploading and then accessing the OpenStax testbank.  I have tried uploading as QTI (the file is zipped) and it uploads but then is not visible anyway, not in Quizzes or in "available test banks"- I have also tried uploading as a zip file but then it's just a file sitting there, not in the test bank.  Anyone know a workaround for this?  If it helps- I am teaching Macro & Microeconomics and using the second edition