How to check how much space secure folder is taking up

[Smskdj]

Whenever I check my storage it is missing a a lot of GB. Which I assume in is the secure folder.

 

[Rukbat]

Find the secure folder in a file manager. Long-press it and it should give you a choice like properties. That will tell you how much space is taken by the files listed in that folder. (The files aren't actually in the folder - a folder is just a list of files. The files are in "storage", but only accessible from the folder they're listed in. [Even /, the root Linux folder, is listed in a list called /. Everything comes from that.])

As for "missing GB", install a terminal app, like Terminal Emulator for Android. In that, enter the command

df

and tap the return/enter key. (Holding the phone in landscape mode will let you read the listing easier.) The last line is most likely your storage - emulated/0, or sdcard (no, that's not your SD card). Read the headings and you'll see the total space (in 1k blocks), the used space and the available space. That's the space you get to use - what's on that last line. The rest of the 64, 128 or 256GB is used by Android - you can't use that. (That's just the way Android works.)