No longer maintained as I have completely stopped using SD cards in favor of direct printing through OctoPrint.
Shows long file names in the SD List
More info here
Install via the bundled Plugin Manager or manually using this URL:
https://github.com/Petttkous/OctoPrint-Longpathsdlist/archive/master.zip
When too many files are present on the SD card the serial communication could be overflooded. This could result in the printer pausing while printing over USB for a few seconds at most. Use at your own risk!