Test release for file improvements. It supports both SPIFFS and LittleFS for the local filesystem. If you have an SD card, you can switch to LittleFS as follows:
$localfs/migrate=littlefs
That will backup all of your local files to the SD card, reformat the local filesystem to LittleFS, then restore the backup onto the newly-formatted local FS. You can go back the other way with:
$localfs/migrate=spiffs