Zenny writes:
> Also the Bengali letters were omitted with:
Sorry, this is the correct MWE:
#+LaTeX_Header: \usepackage[english]{babel}
#+LaTeX_Header: \usepackage{fontspec}
#+LaTeX_Header: \newfontscript{Devanagari}{deva}
#+LaTeX_Header: \babelprovide[onchar=ids fonts]{sanskrit-devanagari}
#+LaTeX_Header: \babelprovide[onchar=ids fonts]{sanskrit-bengali}
#+LaTeX_Header: \babelfont[sanskrit-devanagari]{rm}{Noto Sans Devanagari}
#+LaTeX_Header: \babelfont[sanskrit-bengali]{rm}{Noto Sans Bengali}
<some text in english>
<some text in devanagari>
<some text in bengali>