Server 2022, network drives and content searching

We have two drives with close to 1TB of data,

The one drive has a specific folder where end users want to search for a file using content from the files. The files are generally .xls based files

End users are 99% Windows 11 based and server is server 2022.

Indexing on the server with content aware filtering has occurred and can find the files when searching for their names however not when searching content.

This needs to happen using Windows Search in explorer.

Data is unstructured, however structured in a folder system. (Year, month, etc)

I have read that Windows Content Search is not supported on network drives, can this be confirmed? 

Any suggestions on a resolution would be appreciated.