different versions of autocad

[kgm2535]

how do you work with acad 2018, and earlier versions .

i get a message about  aec objects compatibility when xref drawings for mechanical overlays

attached pdf message stopped the revision cloud

it says to enable proxy graphics

not sure what to do or way to set up drawing

thanks

[pendean]

HELP explains the three variables you need to use:
PROXYGRAPHICS
PROXYSHOW
PROXYNOTICE

HTH

[kgm2535]

when should the proxy graphics be used

the person sending a file 

[pendean]

You both should have these variables on all the time.