Are locked cells in a imported excel file supported? They don't appear to be.
Also are hidden sheets able to be supported as well?
Disabled cells are currently not supported in the intermediary Workbook model that is used for transferring data from the DPL workbook.
If this feature is important for your project I recommend filing a request for this feature on our Feedback Portal. This will help us gauge the overall interest and prioritize.
Regarding the hidden sheets, there is a feature request already and you can cast your vote for it at the below link:
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