You could look into this: SwiFTP Enables FTP Access to Your Android Phone
And access your directory structure via FTP. Though not sure if you'll be able to browser outside of the /sdcard partition or not. May want to try another disk usage app (maybe this one? https://play.google.com/store/apps/details?id=com.mobile_infographics_tools.mydrive&hl=en) to see if that's actually the directory that the movie may be in.
Are you sure that it doesn't just stream the video?
And access your directory structure via FTP. Though not sure if you'll be able to browser outside of the /sdcard partition or not. May want to try another disk usage app (maybe this one? https://play.google.com/store/apps/details?id=com.mobile_infographics_tools.mydrive&hl=en) to see if that's actually the directory that the movie may be in.
Are you sure that it doesn't just stream the video?