Try the "Append Paper Space(s) to Layout book" and verify that the information is there. It is possible that the data is only in "Paper Space" and that the "Model Space" is empty.
You might check that the layers are not turned off.
It is also possible that the DWG needs an Xref that you don't have and therefore it is empty.
Do a google search for eDrawing which is a FREE DWG viewer to open the file before importing it into AC.
Eduardo Rolón AIA NCARB
AC27 US/INT -> AC08Macbook Pro M1 Max 64GB ram, OS X 10.XX latest
another Moderator