I was unsuccessful trying to use the tm_combine function. I tried this code
alldocs <- tm_combine(c(tdocs, ndocs,bdocs, recursive=FALSE))
message on the console was
Error in tm_combine(c(tdocs, ndocs, bdocs, recursive = FALSE)) :
could not find function "tm_combine"
I'm using R version 3.6.0
tm version .7 - 6
Thanks!