I saw several articles like this one that describe how you copy and paste from Excel into a worksheet view or a list in quick edit mode.
3-ways-import-excel-sharepoint
the problem with this is you can only paste into the blank cell at the bottom. if you highlight the first cell and attempt to copy over what's already in the list, it gives you this error:
The information cannot be pasted because the paste area is not completely within the grid. Paste into a different cell or try inserting more columns and or rows into the grid
How do you bulk paste (like a thousand rows from Excel) into a list, and paste over all the existing list values that are already there? Thanks for any feedback!