What the screen says, and why
Each sentence the sheet shows when an address, a save or the clipboard is refused.
When the screen says something
- "B0" is not a cell address.: what was typed beside the address is not one — a letter and a number, as B12.
- Not saved: …: the sheet could not be kept; the sentence says why. What you typed is still on the screen: save it as a file.
- Copy one range at a time; several cannot be pasted as one.: a selection of several ranges was copied.
- The clipboard cannot be reached from here; use Ctrl+C and Ctrl+V.: the browser keeps the menu's copy and paste from the clipboard; the keys work.