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Task was assigned to Marco Mori and status was changed: Open → In Progress

I can not upload these spreadsheets, I don't understand why. I'm using the format you provided, I also tried to change format from the excel, text -> text, population -> number....

Hey Marco,
I've checked your files and can see that you didn't use the correct date format. Instead of just the year, it should be YYYY-MM-DD, see the example here. Please adjust it and try it again. If you still have issues, let us know. Thanks.

Thanks Carolin, I'll try again ;)