General ⇒ Package xr warning: No file file4.aux LABELS NOT IMPORTED on input line 30

[almcgowan]

Hi everyone,

I'm working on an article with tons of appendices that we need a cross referencing system for. Since we user hyperref, I gave the xr-hyper package a try. After MANY attempts, I got it to work with three external documents, but the moment I add a fourth, I get the error message "Package xr warning: No file file4.aux LABELS NOT IMPORTED on input line 30".

Here's the thing: We're using Overleaf (and pdflatex). Doing this locally is unfortunately not an option at this point.

I've read every thread I could find, applying all the working examples I could find, but to no avail.

I'm attaching a MWE of the various pages below. Can anyone figure out why on earth it won't accept references to the fourth file?


minimal working example

minimal working example

minimal working example

and finally, an example of the rest of the files:

minimal working example

[Johannes_B]

Crosspost https://tex.stackexchange.com/q/534070/37907