I don't seem to be able to copy and paste into a table, does anyone have the same issue?
copy and paste into the table
Copy and paste in tables doesn't currently function reliably in Manuscripts. One workaround if you are having trouble copying and pasting from Excel is to copy and paste into Word, and from there into Manuscripts.
(copying and pasting in tables is difficult to do reliably and well. Scrivener, which uses the standard Apple textView, and is otherwise a great program, is notoriously terrible at it)