Where is media entry located?

@jess Thanks for the reply ,
i kept searching till i found that the media are stored under /opt/kaltura/web/content/entries/data …etc but i could not tell which file is which because the naming was random id’s instead of the file name i guise , can we have file name here ?
#2 as drop folder : while doing the configurations the path was for i.e /kaltura_media
which has
/kaltura_media/dir_one_media/dir_one_category
/kaltura_media/dir_one_media/dir_two_category
/kaltura_media/dir_one_media/dir_three_category
/kaltura_media/dir_two_media/dir_one_category
…etc each has deffrent media ".mp4 .jpg .srt "
then in my publisher account under drop folder i get the error "Faild to parse file name according to drop folder naming convention definition ."
WHAT AM I TRYING TO ACHIEVE HERE ? i ahve a folder full of media .mp4 .jpg .srt divided into sub folders so i could know which category they are ,and i wanted to use the drop fodler so i could import them all to as media entries where i can prepare them for Q#3.
#3 suppose i have an entry i already add captions and had the media transcoded into “Flavors” i can share single embded link to my website which all sound ok till , my mobile app is expecting a url of this format “http://example.com/hls/videos/big_buck_bunny_,6,9,15,00k.mp4.urlset/master.m3u8” is there a way where i can get this url for the media flavor’s of the entries i had .
#4 which i think it might be related to #2 is there a way where i can have separate fodder to store my media in case kaltura CE re install accrued .to have them safe separate i mean ,with nice structure of sub folders …etc.