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Answers
How did you upload the excel file? If you use "Add data" button, most of the time the data will be stored in your local repository in the end of the loading process. You can also try "Read Excel" operator for big Excel files..
Check out these tutorial videos from Academy
https://academy.rapidminer.com/learn/video/data-loading-via-a-process
https://academy.rapidminer.com/learn/video/importing-data-in-rapidminer-studio
Cheers,
YY