"No drizzle data files have been assigned to integration source images."

[prefetch]

i'm using the ImageIntegration process, and i'm trying to add my .drz files and it replies with this error:
"No drizzle data files have been assigned to integration source images."

what does this mean?  i tried to google it and nothing came up.

am i doing this right?  or am i mixed up about how this works?  in the 'registered' folder after preprocessing there are a bunch of .drz files that i'm not really sure what to do with - i assume that this is what they are for?

[prefetch]

okay, i think i figured out at least part of my question.

it looks like i'm supposed to use the drizzle files that come out of StarAlignment when i check the 'Generate drizzle' box.  those seem to be accepted by ImageIntegration.

of course, i dont really understand why i have other .drz files generated from BatchPreprocessing.

i love PI but yeah, it can be overwhelming.