video files disappear sometimes in hidden folders

[AC Question]

hi,

I'm facing a problem with my nexus5 that i haven't found a solution yet on internet.sometimes i copy some videos to hidden folders in es explorer file manager/Video/.temp.sometimes those video dissappear but can be seen on pc if connected in mtp mode.then i try to recover those videos by moving or copying them but nothing happens literally.they wont play either.i dont whether they r taking free space or not but they can be deleted.and yes i havent enabled recycle bin option in es explorer also.pls help me