Roll multiple dice types, keep highest two

Hi, I want to be able to roll many dice of different sizes and keep the highest two. I already tried /r 2d8 + 1d10 + 3d6k2. Doesn't work. Tried a couple other alterations. Anyone know the special sauce way to write this?

/r {1d8,1d8,1d10,1d6,1d6,1d6}k2 This will work, but there might be a more elegant way of writing it.   I presume you meant that you wanted to treat each die as an individual.  But perhaps you meant this: /r {2d8,1d10,3d6}k2

That "code" keeps the two highest dice sets. For example, 2d8 (4, 5; total of 9), 1d10 (8, total of 8), 3d6 (1, 2, & 3; total of 6) results in a 17 (9 +8). I was hoping that if you had the rolls I just listed it would only grab the 5 and the 8 - the two highest individual dice.  I am really appreciative of what you showed me b/c I didn't even know how to do that, but it isn't what I need. I am hoping that maybe you or someone else might know how to do what I just described. Thanks!

Unfortunately the Roll20 dice system has a lot if limitations. Peter's first line is the best you can do without access to the API (needing a Pro Subscription).

You can use /r {2d8 + 1d10 + 3d6}k2 Single sub-roll group expressions have various exceptions and restrictions so it can be counter-intuitive

Oh yes, i forgot you don't have to separate them inti separate groups with comma. Nice.

Based on what you said I tried separating each dice (instead of 3d6, 1d6 + 1d6 + 1d6) and when separated it all works as I want.  Thanks.