Please compile with --enable-multibuffer to enable M-f multibuffer
support in the editor.
-------------
nano -V
GNU nano, version 6.2
(C) 1999-2011, 2013-2022 Free Software Foundation, Inc.
(C) 2014-2022 the contributors to nano
Compiled options: --disable-libmagic --enable-utf8
-------------
https://www.nano-editor.org/dist/v2.3/faq.html#3.7
3.7. Tell me more about this multibuffer stuff!
To use multiple file buffers, you must be using nano 1.1.0 or newer,
and you must not have configured it with --disable-multibuffer nor
with --enable-tiny (use nano -V to check the compilation
options). Then when you want to insert a file into its own buffer
instead of into the current file, just hit Meta-F, then insert the
file as normal with ^R. If you always want files to be loaded into
their own buffers, use the --multibuffer or -F flag when you invoke
nano.
You can move between the buffers you have open with the Meta-< and
Meta-> keys, or more easily with Meta-, and Meta-. (clear as mud,
right? =-). When you have more than one file buffer open, the ^X
shortcut will say "Close", instead of the normal "Exit" when only one
buffer is open.