Just purchased a month of Sketchup Go (web) and can't open files

I’m trying to open files that my client has sent me. The files open fine on the sketchup viewer but when I try to open them in the version I’m paying for via the web I’m just getting an error message saying the files aren’t valid … I’ve been looking for hours for a solution and I don’t see anything…

hi.

could you share one ? if sketchup says they are not valid, then they might be broken or something.