We are having intermittent issues where certain file submissions are not being read by Moodle. For example, as we can see from here , the student has indeed uploaded the file to Moodle and we can confirm this by looking at the logs for that user.
I can also confirm that the file entry exists in the moodle database under mdl_files table with the pathnamehash and contenthash but I cannot seem to find the file stored under the moodlefilestore dir. We are using NFS where the filedir/ sits and we are not able to locate the file under filedir/contenthash path ( xx/xx/........ ) .
Would anyone know as to why this seems to be an issue ONLY with certain files and not every file uploaded to Moodle.
using moodle 2.8.11
What version of Moodle? For the files that are not being found, can you find anything that is similar (long file name/file type/size/all in a single course etc?)
If there is no apparent link between the missing files, I would suspect that maybe you had a connection issue with your NFS server.