I am writing a book using the Springer SVM monograph class. I want to create multiple indexes, and have found a few resources: How can I have two or more distinct indexes? http://www.texfaq.org/FAQ-multind
...and others
At the end of each of these descriptions it says to "execute the following commands" '''makeindex myfile makeindex myfile.adx -o myfile.and'''
My issue is that I am using Overleaf to collaborate with my coauthors. I'm not sure how to "execute commands" in Overleaf, and thus cant seem to make these options work. How do I execute commands in Overleaf?
A small use case can be found here: https://www.overleaf.com/read/wgrfqbmkrmwv
Compiling in overleaf gives one index (the one containing FAQs}, but not two.

\newindex{aut}{adx}{and}{Name Index} .... then in the body of a chapter I have: \index[aut]{Another Idiot} \index{FAQs} ... then back in the main.tex file, after all of the "include" statements I have:
\printindex \printindex[aut]
only the first index shows.
– Deborah Weeks Feb 08 '21 at 21:40Latexmk: Index file 'dd820.adx' written ==> but it has an extension I do not know how to handle <==that must be fixable.. – David Carlisle Feb 08 '21 at 22:10