[olympus]

@olympus that sounds more like a Kodi improvement. Kodi doesn't load local subtitles when it plays an strm file.
May be there could be a workaround with the addon, but a research is needed. You can create a ticket in the github page to have it in the list.

 What I have tested about strm files

Krypton
Information on playback: Doesn't work
Mark as watched: Doesn't work
Local subtitles: Doesn't work
Resume points: Doesn't work

Leia
Information on playback: Works
Mark as watched: Works
Local subtitles: Doesn't work
Resume points: Doesn't work

I am not really sure if Local subtitles and Resume points could work because Kodi probably is not sending to the addon the location of the strm file,
Kodi likely sends the plugin path.

Do you mean to make a ticket on the addon's github account?
https://github.com/cguZZman/plugin.googledrive/issues
I don't have a github account, I will create one if you want to create a ticket.