Get File/Directory Info - AppGyver WebApp

Can someone confirm for me whether WebApps made with AppGyver support reading from/writing to a local filesystem?

I have been trying for 2 days now to get AppGyver to read local files and directories while running both on my PC and within an un-sandboxed Inox instance on a Pi with zero luck. I have tried every file path format I can think of but the file/directory info plugin always returns “No file found at [whatever path I’m trying]”.