Please help - Copy & Pasting from Excel to Smartsheets not working

I am new user on smartsheets at my new job, I am unable to copy & paste from Excel to Smartsheets multiple cells. Copy works in Excel but Paste is grayed out in Smartsheets. This seems to a major problem for years as I read all the community discussions about it back several years. I am on Mac, using google chrome ? I am also wondering if it is only an issue for Mac users? The other users in my office are on PC. Please help anyone.

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