The .srt extension is a part of the video rip file; which means downloaded from the Internet it can only be processed by VLC or another type video viewer in Linux. Thunar will certainly ignore the extension in normal file manager mode and default to the language extension and thus take that for a potential system file and expect separate directories. There are probably some workable tools for this, but I expect simply adding a container or db partition would eliminate the issue i/e mount and download to one directory within them directly. I would check the VLC board as this may be an already solved issue.
TC
Here: https://fileinfo.com/extension/srt
and here: https://en.wikipedia.org/wiki/SubRip
and here: https://en.wikipedia.org/wiki/Matroska
TC
Here: https://fileinfo.com/extension/srt
and here: https://en.wikipedia.org/wiki/SubRip
and here: https://en.wikipedia.org/wiki/Matroska
All opinions expressed and all advice given by Trinidad Cruz on this forum are his responsibility alone and do not necessarily reflect the views or methods of the developers of Linux Lite. He is a citizen of the United States where it is acceptable to occasionally be uninformed and inept as long as you pay your taxes.