Blackberry 10 users don't really know how to hide their files on their phone and had no choice than to use the regular Hide option which comes with the phone gallery, and they can't even hide videos.
Here's how u can hide any file on blackberry 10.

Step 1: goto File manager and create a separate folder where you will move your files

Step 2: Create as many sub-folders as possible, as for me I created 25 subfolder using unsuspecting names. As u can see I name one of the folder (create folder), (Hospital folder). Noone will think there anythng behind such file

Step 3: Move the file you want to hide to d last folder

Step 4: click and hold on the file u want to hide after u move it, wait for the option tray to slide out and click on properties.

Step 5: Rename the file to any other format you want.. (renaming the file will make it unreadable to d phone)

As u can see I rename my file to (booboo.bar) it was formerly (booboo.jpg)

Step 6: your file is hidden.

Only few free applications on Appstore hides ur files, and it will even have a maximum number of files u can hide.
Those apps perform exactly same function (renaming the file)

Most file hide application are not free and will require you to upgrade to pro version...

Note: you can do this to any file.. (.jpg, .mp4, .mp3..etc)
you can download Filelock to lock your file manager thereafter, with this you have put your files in (kirikiri maximum prison) no human being can view it.

Why do I need to hide any file in the first place

Need to hide some files on my c8 too

missKiffy:
Why do I need to hide any file in the first place

to keep it away from unAuthourized user...e.g thief.