Import .txt file to OO for iOS

I have a workflow on MacOS whereby I annotate pdf’s, then export the highlights (or other annotations) as a .txt file. Then, I can open that file in OmniOutliner for Mac to create a summary with the page # in one column, and the annotation in another. This creates a nice summary. I have not been able to figure out how to do this on OO for iOS, though.

Isn’t it possible to import/open a .txt file in OO for iOS, or am I just missing that options somewhere?

Secondary question. Can one access OO for iOS in the Workflow app? (OF shows up, but not OO that I can find). If not, I’m curious why that integration isn’t possible.

Thank you.