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NOTE: xlsio doesn't seem to be in the Control list. And since that's a required field, I chose DocIo instead.
I'm using sfUpload and xlsIO.
If the user uploads an xls, I want to save it as xlsx before persisting it on the server.
How can I do that?
We have prepared a sample for your requirement of uploading an xls file and saving it as xlsx file. This sample is attached for your reference.