Cannot copy and paste in Online Excel cell

Hi Marcy, 

Welcome to the Box Community!

I'm sorry to hear about the trouble with copying and pasting data in your Excel file via the Excel online application.

Since this functionality is owned by Microsoft, I have looked up sources outside of Box on these Microsoft forums and they may have some suggestions for you:

• https://support.microsoft.com/en-us/office/copy-and-paste-in-office-for-the-web-682704da-8360-464c-9a26-ff44abf4c4fe 
• https://answers.microsoft.com/en-us/msoffice/forum/all/excel-online-cannot-copy-within-excel-online/46bbedac-f6c3-450f-9213-392a8f7af464 

I'd recommend reaching out to Microsoft for further assistance should none of the tips shared in the above forums do not work for you.

Let me know if you have any questions and I will do my best to help!