cloudagent is considered a miscellaneous file so it could be anything from files/pics linked throu your dropbox which are unfortunately still cached on your phone or if you use Google Play Music, the large size might be from music that's pinned to your device.
Press the miscellaneous files line and you'll see something like 6.3GB or so (my phone says 6.3GB) is for system memory (which I think is basically the Android system and related files), and the rest will be a listing of space used by various apps or processes on your phone.  Most of it part of the OS and probably files that the phone needs. You can tap on it and it will show you what files they are. Some you can delete if you want to but I wouldn't touch it unless I was a phone expert and knew that the files I was deleting wasn't going to interfere with how my phone would perform. In my phone when i first got it, there were some files already in there which I believed that they came pre loaded in the phone. Your answer sounds logical though because when I check mine now, there are some that weren't in there b4. How to clear up some of your device’s memory. Whenever my phone’s memory starts getting filled, I proceed to clean up some free space in this order: 1  Click on “Cached data” and clear it all. 2  These are the files that build up with time and aren’t at all necessary to keep. Photo by Nicole Cozma/CNET. Files you've downloaded, photos you've taken, as well as data stored by apps, are major contributors to unnecessary clutter on your Android device. By cleaning out a few things, you gain space for new apps, system updates, or maybe a larger portion of your music collection.  cloudagent is considered a miscellaneous file so it could be anything from files/pics linked throu your dropbox which are unfortunately still cached on your phone or if you use Google Play Music, the large size might be from music that's pinned to your device. In my phone when i first got it, there were some files already in there which I believed that they came pre loaded in the phone. Your answer sounds logical though because when I check mine now, there are some that weren't in there b4. 1 Apps: the space taken by your installed apps, their cache, and their data files. 2  Pictures, Videos: how much storage your current camera-produced photos and videos are taking. 3  Keep in mind that if you have image files stored outside of the Camera or DCIM folders on your card, they won’t show here. Whenever my phone’s memory starts getting filled, I proceed to clean up some free space in this order: 1  Click on “Cached data” and clear it all. 2  These are the files that build up with time and aren’t at all necessary to keep. I was checking out the storage usage on my S4 and see that miscellaneous files takes up 6.39GB--almost half of the available storage. I checked with a few other folks who have S4s, and the other guy who has a Verizon S4 also has 6.39GB used by miscellaneous files. The phone comes with 16Gb of memory. If you havent loaded anything on to the internal memory then the misc files would probably be Software and Aps that Samsung and Verizion loaded onto your phone before purchase. I don't think it is possible to ID each and everyone on the files that are marked Misc When I select Misc files in the Storage Menu, it brings up a few things, but nothing adding up to 5.5 GB or even close to that! When I clear all of the items that do come up in Misc files, it only brings the # down My Available space is only 492MB. What is in Miscellaneous files that it is taking up 1/3 of my device's memory? I can't update any of my apps because it says insufficient storage space. Files in Bluetooth, So we had sent a mail to Verizon regarding the 6 GB Miscellaneous Files in Storage and we got a reply saying that – “this space is used up to hold the pre-installed applications in your device like the Samsung official Apps.”. 
http://forums.androidcentral.com/verizon-samsung-galaxy-s4/326807-miscellaneous-files-usage.html http://forums.androidcentral.com/samsung-galaxy-note-2/233016-storage-settings-miscellaneous-files-what-6-gb.html http://www.androidbeat.com/2014/06/memory-full-find-eating-phones-storage-clean/ http://www.cnet.com/how-to/clean-up-files-on-your-android-device/ http://forums.androidcentral.com/samsung-galaxy-note-2/233016-storage-settings-miscellaneous-files-what-6-gb.html http://www.androidbeat.com/2014/06/memory-full-find-eating-phones-storage-clean/ https://community.verizonwireless.com/thread/799249 https://community.verizonwireless.com/thread/856228 http://techknowzone.com/what-are-miscellaneous-files-in-glaxy-s4-and-s5-storage/
what are the misc files on my phone