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Thanks for your time getting in touch with us today, laurabreighner,
I can share some insights about importing files into QuickBooks Online.
Presently, the supported file formats for importing files into QBO are as follows:
Since you're using a GJE extension file, you'll need to manually convert the file first to CSV or XLS formats. Once done, you can now import the file into QBO.
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Please let me know how it goes, laurabreighner. I'm here if you need further assistance. Have a great day!