Try creating a symbolic link (google it if unfamiliar) outside of the shared directory such as on the desktop or user documents that points to the containing folder in the shared location. Then open the files from this alternative path. This will not duplicate the files but will trick C4D into thinking they are located in a different path. This is just a hunch but has worked for me in certain situations similar to this in the past.
i put on Command promt this : mklink /D "C:\Users\victor.camacho\Ogilvy\TYO-BAT-Creative - Documents\2020\01_07_alwaysOn_instagram\10_Creative\A_PROJ\3D\01_WK4\12_06_kenFurudate" "E:\projectsOffline\01_07_alwaysOn_instagram\10_Creative\A_PROJ\3D\01_WK4\12_06_kenFurudate"
but it gives me this error: "mklink : The term 'mklink' is not recognized as the name of a cmdlet, function, script file, or operable program.
Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
At line:1 char:1
+ mklink /D "C:\Users\victor.camacho\Ogilvy\TYO-BAT-Creative - Document ...
+ CategoryInfo : ObjectNotFound: (mklink:String) , CommandNotFoundException
+ FullyQualifiedErrorId : CommandNotFoundException