I'm having the exact same problem. I lose formatting after reading all of the sheets into objects, then writing/updating them to form a master sheet. The documentation is pitiful, and there are no examples anywhere on the web for doing this. What I'm doing is pretty simple... I open up the first worksheet in a workbook, populate cells, and then write the entire spreadsheet but none of the other sheets will recognize my data from the first worksheet, unless I read every single sheet of the Excel file then write/update them all out again which causes me to lose formatting on all pages except the first worksheet.... I have wasted literally days on this.
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