Co-DM can't access my compendium content for a game where I've shared it

so... For our gaming group I buy all the content and then enable content for each game.  Sometimes I'm the DM, sometimes someone else is, sometimes we do co-DMs Right now I just created a new game and I can see all the monsters from purchased supplements but my co-DM cannot.  We are doing DnD 5e and he can only see the SRD. What am I goofing up? thanks!

Make sure sharing is turned on in that game. Double check to make sure those sources are shared in the game. You might have to greenlist individual sources, but I don't think that's essential.