When an Excel file with multiple worksheets is uploaded, there's an interstitial that says "Multiple Worksheets detected in your file. Select one for upload." and the user selects one, and it's the one that's imported. The original_filename of the file is included in the payload, but the name of the selected worksheet is not included. If I upload a file with three worksheets, at the end I'll know that they all came from file1.xslx, but what I really need to know is that I have three distinct imports from three worksheets from within that file (and their names): (for example, file1.xslx - friends, file1.xslx - enemies, file1.xslx - neutral).